Not surprising that PDF comments were being used as a task list/tracker. In the same manner, Google Docs supports “@-mentions”, “assign to”, and “resolved” functionality for comments.
All you can do is send feedback to Adobe somehow and hope they add that feature back in. In the meantime, best to find an alternative workflow.
I’ve heard of publishing software to design photo albums/scrapbooks/cards etc. Is there a photo collection manager for archiving, sorting and filtering?
Given access to a large set of personal photos, say tens of thousands, it should be able to group, categorize, tag, and sort along a myriad of dimensions.
Example dimensions would be time, people and places. It would need some facial recognition/image classifier/similarity scoring capability.
There definitely are some cloud offerings today that do similar things, but I’d want it to work locally for privacy and practical reasons.