P: I would like to synchronize over LAN/Cable instead of internet

Right, and smart previews particularly don’t help if I want to load images on my iPad first (while travelling) and then continue working on my desktop afterwards, since I am forced to sync all my 30mb raw files over the cloud.
I completely agree with what you are saying while trying to understand why Adobe is prohibiting modern mobile workflows (which in my opinion should allow backups and culling without a laptop).

This seems likely, but it still seems like they're forcing pros to use (what they hope will be) their consumer service (not unlike Apple, but at least Adobe still has their pro DAM/processing app). No matter how good Sensei gets, it's not going to meet most pros' needs (great, you identified that shot as a bird, but I want to categorize by what kind of bird), and the volume of shots a pro can generate over a short period of time and then have to wait to bounce to Adobe's servers and then back down to tablet/phone, far outstrips most casual photographers.

Even with the discovery that Smart Previews don't count against the 20GB quota doesn't eliminate the irritation of being forced into a slower workflow because Adobe has some fantasy that they're going to compete with Apple and Google for the masses' photo processing and cloud storage needs. It's not going to happen, and forcing your best, most loyal customers to jump through suboptimal hoops while you chase the impossible dream doesn't really do anybody any good.

Interestingly, I thought that the 20GB limit would work differently than it does when integrating with Classic CC. I decided to try syncing a my entire catalog with the cloud, just to see how quickly it ran out of space, and made an interesting discovery: Smart Previews don't count against the 20GB cap. Since they also sync relatively quickly, this actually makes Lightroom usable as an edit-and-view-anywhere service for pros using Classic CC. I have a 50k+ image catalog synced with the cloud, and I'm using less than 1GB of my 20GB of space.

There are still some things I wish worked differently: I still would like LAN sync, nested folders in collections carrying over to Lightroom CC would be most welcome, and keyword handling still has issues. Overall, though, I'm getting happier with the service and how it integrates with my workflow and needs.

I was actually wondering whether it has to do with Sensei.
Anyway, collaborating with one of the major NAS brands (QNAP, Synology) could solve many problems in one go: faster sync speed, decent catalogue backups, privacy of images, access to the catalogue from various devices (desktop, laptop, tablet, smart tv, Webbrowser), storage capacity,...
Why is Adobe ignoring these benefits? Even if Sensei was one of the reasons why Adobe is pushing towards the cloud, they could synchronize relevant metadata between the NAS and Adobe Cloud.

Exactly, it’s entirely a money grab but it’s short sighted. For many of us requiring the snyching of originals via the cloud cripples their software. For me it’s a deal breaker so rather than getting more $ from me for more storage they aren’t getting a dime because I won’t subscribe to any of their plans unless this roadblock is removed.

You know why they won't implement any practical solution ? Because they want you to hit the 20Go ceiling and purchase a bigger storage plan. That’s why they won’t make it easy to bypass the online solution...

Lightroom mobile does not work over Ethernet for me on a pixel phone or a Chromebook. Every other app on my phone or Chromebook works fine. At least I'd like to sync to creative cloud using my Ethernet connection.

I'd like to see adobe add the ability to view and edit photos across connected platforms either via Wifi or Bluetooth. 

Most professional photographers or travelers don't have access to the internet (or it's very slow) while traveling so editing locally would be much better.

I'd prefer Lightroom to be able to connect and see photos locally so we can start an edit on Mobile and continue on PC without needing an internet connection. 

To be clear adobe (agents) we don't want a Lightroom cc Plan because we don't have interent connections. 

Look forward from hearing from other users and also Adobe.

Synchronization between devices is great but right now the only way to do so seems to be via your cloud service. This is slow compared to via a local network or cable connection and in addition the 20GB cap on the Photography Plan means that I cannot store original RAW files on my ipad and then synch them to my desktop due to this data cap. I typically am off the grid for a week at a time and with 60-75MB RAW files 20GB is reached quickly. While off the grid I cull images and rate them thus the need to synch rather than just copy from my device. For me the current system for synching is a deal breaker as I will not pay Adobe's $10/mnth additional fee to move from 20GB to 1TB when I will not be actually storing images in the cloud and the synching process is so slow. It has meant that I will be abandoning Adobe products for the foreseeable future rather than subscribing to the photography plan. If a more workable solution for synching my originals was in place then I would subscribe.

I wish to add my voice (and vote) to those who wish to sync Lightroom Mobile with Lightroom desktop without needing the cloud. When travelling I wish to import my photos to my laptop and back them up to an external drive. Now I have my original SD cards, the laptop and the external drive all with copies of my photos. At this point I'm properly backed up while travelling.

Then I wish to do preliminary entry of location data (while I still remember) and some basic metadata entry. Maybe a little work that can only be done on the desktop version such as Match Total Exposures, adding labels (I label all my panoramas and HDR shots for later processing) and some presets. After that, I want to sync everything to my iPad and work from there. It's especially excellent for rating photos as well as some light work in the develop module. I don't want to be hunched over a laptop while on vacation and it's no fun at all on long flights where the person in front reclines their chair back and crunches the screen.

The above works reasonably well if I'm travelling where there is good internet access. However, most of my travels are where there is no internet (mostly) or else where the internet is so poor that even accessing text only emails is a frustrating experience. Also, I don't want to have to purchase expensive data plans when travelling abroad just to be able to perform this sync.

I don't care whether a cable is required, or bluetooth, or a wifi connection between the two devices. Just make it happen!