This conversation has been merged. Please reference the main conversation: Lightroom Classic & Ecosystem: Better support for comments and likes, in ALL publish services
Having just finished a 30-minute conversation with an Adobe tech, there is a very inelegant way to do this using Metadata (on LR desktop) to create a smart collection, but it was not entirely accurate in any of the three tests I did.
Best case would be to have simple filtering buttons (on all the LR interfaces: desktop, web, mobile) - similar to Flagged, Unflagged and Rejected - for those photos that have been "favorited" or commented upon.
This filtering would be EXTREMELY useful to the photographer, but I can also see it being helpful functionality for clients, as well. For example, if I limit a client to 20 selects from a take, and they make those selects using either comments or favorites (or both), there is no simple way for them to see, at any point, how many photos they've chosen, unless the scroll thru every photo in the collection and keep some kind of tally sheet.
Thank you for your consideration and I will hope to see this functionality in a future upgrade.