I'm sort of bummed that descriptions went away; I knew they were buggy (I had to fight to keep them on my photos), and I appreciate that photos display better now, but some of mine now seem a little weird like https://rebrickable.com/mocs/MOC-4434/Tomik/9394-hovercraft/#photos. I had a description about what a 20-year difference in Technic designs looks like, with a link to the other set pictured. Now, it's just like "why you taking pics of two sets, dude?" It would be awesome if this could come back, perhaps even as something fancy on over a la https://www.the-art-of-web.com/css/textoverimage/#section_3. Or maybe have a better way to reference images from comments, since I also chat up my photos there, too.
But in any case, I'm glad to know I'm not just crazy and forgetting things; this was a deliberate decision. :)
(And if I've been committing a cardinal sin by uploading comparison photos like this, I'll be sure to stop)