Another vote from me for the ability to view all post likes. This is very important to my community.
On a side note, those rows or walls of avatars are one of my biggest pet peeves in Discourse: If I click to reveal who liked something, I want to see names, not just avatars! The avatar-only design feels like a bit of a cruel joke to me: Showing you the right information but not in a way that’s in any way useful or parsable for a regular human, so on desktop you’re left slowly revealing the hover cards to identify people, and on mobile… you’re just out of luck. :-(
(I got desperate enough to make a simple CSS theme component to replace the avatars with names, but it can’t get around the new user limit and I wish it wasn’t necessary in the first place as most forums keep the default design.)