While I still build for 20.04 libc it's kind of ridiculous to expect everyone else to do as well.
Any modern dev I recommend to pick an "older libc" for their builds, to cover edge-case users like yourself, but I think most will maybe do 22.04 at the latest today. I personally use Debian Stable (13 as of writing), and if I notice a plugin doesn't run because of its libc dependency I notify the dev and request that they build on an older libc like Ubuntu 22.04
If you are still running 20.04 as a daily driver (not just a build target) then you can expect these kind of issues. Don't blame the platform, but blame your own laziness to not update
Note that this has absolutely nothing to de with "ABI stability". The issue here is libc compatibility which is only forward-compatible and not backwards.
(in the sense that a system can run binaries made using older libc, but not newer)
