> they regressed in this regard, the dumpster fire that was song reposting was the final nail in the coffin for me

Absolutely, repost spam (particularly repeat reposts of the same song so it would stay at the top) making the feed unusable was what drove me away. Then all the random bugs that persisted for ages, and frequent weird/unnecessary UX semi-redesigns. One bug I recall is that going to a song page then back to the feed would never put me back at the same point in the feed.