I wouldn't be quite so pessimistic. There's a commit for #FetchAllReplies (by @jonny@neuromatch.social, I believe) that seems to be shaping up well, with a seemingly healthy debate going on. Just yesterday @Gargron@mastodon.social posted in agreement that it is a must-fix issue.

They're moving slow, but their reasons for doing so doesn't seem to boil down to an unwillingness to fix it.