A large majority of people who use Slack disagree with you. I've never really had a problem with it and I actually enjoy Slack quite a bit.
a) People who hate Slack
b) People who hate open-plan offices
c) People who can't imagine why anyone would ever have a different opinion than them on such topics
In my company, everyone can work from home or gets own office. Period
How do you know? Most people I know, uses Slack because that's the company policy, not because they find Slack the best option. But I don't think that's the majority of people, because is just my biased view, but probably it's the same in your case.
While I have literal never discussed Slack with someone who likes it. Actually not completely true: at my last company one developer thought it was great but after a few months I heard her curse it as a "place information goes to die". In my experience it doesn't scale beyond a very small number of people who know each other well. Sending commands from its command line is not as easy as simply sending them from, you know, the command line (which is scriptable).
As a side point it astonishes me that after all the money they raised and people they hired they can't get video working on mobile, just laptop/desktop.
You could say the same thing about meetings — they’re where information goes to die. Because a meeting (which is what Slack is) isn’t meant to store information, it’s meant to discuss information.