- Mentions: Many times I've tried to mention someone but Slack goes and picks the wrong person. If I'm typing `@johnd`, then it should be fairly evident that I'm trying to mention `@johndoe`; don't make me go through that UI when you should have enough info already.
- Buggy snippets: Why do I have to go through a slow UI just to paste some code, when triple-backtick should be enough?
- Triple-backtick: No code highlighting. And just try to copy its content; you'll be surprised when your clipboard looks as if passed through an `s/\n/\n\n/g` filter.
- Scroll up: Scrolling up many pages above causes some weird jumps.
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Incidentally, the Discord people got all these things right.
- Resource hogging - Buggy iOS app (especially on iPhone X) - Missing accessibility features - Lack of native app
They've taken $0.75bn in funding over 10 rounds and still suffer from some _basic_ issues.