P: Ability to sync Lightroom Classic keywords with the Lightroom Ecosystem

This is certainly a disappointing limitation. But what's especially disappointing is that it's entirely unexpected (since all other fields are synchronized), and there's no communication in the product that this field won't be synchronized.

At minimum, I'd recommend adding a warning to the user the first time they try to edit keywords on a collection synchronized with Lightroom Classic; that would avoid a lot of frustration and confusion as users attempt to troubleshoot why keywords aren't synchronizing (even though everything else is). 

In my case, I spent an hour troubleshooting this before looking online—and realizing that it was "by design".

Update: In the meanwhile there seems to start some kind of caption sync between LR classic and LR mobile, although I did not check that with hierarchical keywords.
But I am happy that captions which I added "on the road" are no longer lost but show up in LR classic

I just feel in the same way.

All the merged threads are preserved, and though it’s not at all obvious, you can get to them by clicking the link at the top of the merged post.

Thanks, Victoria.  You had pointed this out in the original thread from 7 months ago, but my original post has now been transplanted to here.

John, if the original thread with comments will not be deleted, I suppose it's enough to inform latecomers that it would be worth checking out the prior discussion at the thread. 

It's probably both technical and marketing. Lightroom CC only knows 'flat' keywords, Lightroom Classic has hierarchical keywords (meaning you could have two identical keywords in different hierarchies). That means that you can't simply sync them right now. Of course it should be possible to find a solution, so it's probably a marketing decision not to spend time and money on that.

this is all our logic, unfortunately the logic of Adobe works along some marketing decissions and not their customer needs, disappointing really.

> I could remove the incorrect keyword from the individual photo, but there didn't seem to be a way to do this across the whole system.

There's a trick on the desktop LR CC app. Select All Photos, then the Refine button. Filter to show the photos with the "incorrect" keyword, then select all. Then in the Keywords panel, it'll show the incorrect keyword, and clicking on it will delete it from all of the selected photos.

Unfortunately, the forum software makes merging of the associated comments very painful. If you see particular comments you want visible here, I suggest copying them here under your own name (with attribution).