> edit their messages days later to gasslight you

That is a good point. I like to say `s/foo/bar/` to correct myself rather than edit the message. This is also important if people are receiving e-mail notifications for new messages but not for message edits.

Honestly, invisible edits are a UI problem that people really ought to solve - highlight (or in some way indicate with a color change or such) that something has been edited (and specifically, what has changed vs what is unedited in the comment).

Or perhaps restrict editing, e.g. instead of being able to delete text, you can only strike through+slightly shrink+grey out text.

Not that I really like Facebook, but that's one thing they handled well with their comments. You can click on the edited link associated with a particular comment that was edited and see all versions of the comment.

So if someone edited their comment three times, you would be able to read all four versions of it.

I hope you relly rely lik typos siting there forever.

I'd take typos over that any day.

Plus they don't sit there "forever" because the archiving is usually crap.

Also it's IM. If you're going to obsess over grammar and spelling maybe just use email.

Yup. Slack sucks for work.

- a single window to do stuff with (so you can't really switch between two channels very easily)

- no ability to mark and unmark individual actionable messages as read

- slow as molasses client that sometimes takes seconds to react with high system load (no chance to have your own client)

- inability to integrate with self-developed tools unless you're blessed with an application token

- inability to set up advanced/granular filtering

- no user macros support beyond some primitive workflow automations