This is why I don't personally understand all the Slack hate. It's a godsend compared to every other messaging service I've seen in an enterprise environment. I'm stuck using Webex Teams right now and it's horrifyingly bad.
Being better than [x] does not make Slack good, per se. It might make some thankful they aren't using [x], but that's really about as far as that should go.
I like Slack more than Skype, but I hate Slack with the passion of 1000 firey suns, especially in regard to many UIUX decisions. (Why does the new message line stay on the view AFTER I HAVE RESPONDED?) Not to mention the un...helpfulness (I guess) of their support.
Slack was great when it was new, because it was better in someway than everything else out there. Mind you not the same way for everything, but in some way it was better than most, if not all other options avaliable at the time.
That is not the case now. There are other options that are as good, or better. Slack MUST have been aiming for that 'fuck-you' size the entire time, because once they hit critical mass, they seemingly immediately stopped trying to be better, and started trying to be the one you were already paying; a serious downgrade in my opinion.