"We have both, they're not the same thing."
Unfortunately, we've had Skype foisted upon us to replace organisation-wide mailing lists, and Skype for Business. So now it's completely impossible to filter (was that an IM, an important news item, or someone posting a picture of their cat?).
"Are you genuinely saying you think people should stop trying to make better things?"
Well, if MS could make Teams better, that'd be a start. I've had "phone" calls I can't answer because it didn't render the answer button (restarting it fixed that), it crashing on sending an IM, crashing on getting focus, missed call notifications with no call (i.e. no "phone ring" sound, just a straight "someone tried to call you"), the activity stream doesn't alert to all subscribed activity, etc, on the desktop client. On the web client I've been told that my browser (Chrome) isn't supported, and to please try Chrome...