Anyone who ever used something else than Teams before the pandemic knows how bad a chat app it is, but since eg. management folk never used that stuff before the pandemic but now had to also WFH, they already had Teams from day 1 (M$ pre-installs it I guess, Linux-only guy here), so they forced that horseshit on everyone.
There really is no other excuse for it being the default in many cases these days. But it's absolute terrible.
/rant