My employer buys no Microsoft SaaS service, since we're mostly on Google services, so a stand-alone like Slack works quite well. And nobody uses Google Chat.
And besides that, the UX of Teams is miles behind Slack.
And besides that, the UX of Teams is miles behind Slack.
I haven’t regularly used teams in about a year, but I would legitimately consider passing on a job offer where they used it.
In a thread where many folks are talking about using the best tools for a job, teams is never the best tool for any form of digital communication.