P: Do not require an Adobe ID to add metadata to shared albums

Setting an album to "Invite only" should NOT force viewers to sign in to Adobe, yet it does. The alternative, "Public: Anyone can view" should not be required for invited viewers to view an album.

This is a privacy issue. I do not want "Anyone" to potentially have access to a shared album. I realize they need the link, but that can be easily shared, even unintentionally or without my permission. I only want those who have been granted permission and have accept my invite. Yet, they are required to sign in to Adobe and, frankly, they do not have, do not want, and should not need an Adobe account because I have directly invited them.

Recently I have found that LR web has a feature which offers image proofing. However, if I share a gallery with a client, he/she has to have Adobe ID account ir order to mark their favorite images. Why this is needed, if client is going to use gallery once. 

There are services like cloudspot, pixiest. They do not force users to have their accounts. E.g. cloudspot asks user to enter email and name in order to allow create favorite lists. But do not ask create passoword or provide other data. 

Forcing people to create Adobe account only for image proofing does not make any sense to me. These people are not potential Adobe software clients (most likely). I cannot ask them to create account for one time  and later to hear that Adobe is sending marketing emails, etc.