EDIT: Thank you all for detailing your experience with, and hatred for, this miserable product. Your display of solidarity is inspiring. Now, say it with me:
Since I have not seen anyone mention this problem yet: Teams doesn't let you mute other people in a call for yourself. Obviously also no volume control per person. Imagine sitting next to your coworker in a teams meeting and having to deal with hearing them twice with like 20 ms delay. Awful.
In my experience, neither Slack nor other apps (that all blow Teams out of the water) can do that - except Discord, which isn't exactly a common office meeting app.