I feel this way too. Something about Microsoft office products makes my skin crawl. I remember back when Teams didn’t have native notifications either, oh man was that painful!
It is the worst tool by far on any computer I've used in the past 30 years.
Regularly disconnects Microsoft's own headsets and saturates CPU until the headset is unplugged and re-plugged, good job selling your products together without testing them.
Can't use triple backticks in messages for blocks of code anymore, it never works.
Can't always use single backtick either, unreliable at best.
Pasting will give crazy formatting sometimes and blocks of code sometimes, you can't choose when. Will regularly trim CRLFs, leaving you to input everything manually.
"Inserting" code (instead of pasting it like a normal person) makes the TITLE they force you to input take most of the space, it's like they thought long and hard about how to obfuscate useful information at every turn.
Switching tabs and conversations take a noticeable time, even on a decent beast (12th gen i7, rtx 3070ti, 64gb ddr4). Doing anything is sluggish in that app.
When on a call with somebody sharing their screen, can't hide the stupid vertical bar with names of other people taking 20% of the real estate.
Can't share more than one screen discord-style so half the time colleagues will be quickly shown something, and then have to be reminded to share their own screen again.
Link embeds are slow to parse, office embeds offer more options but are slow to open either in-app or in browser.
Speaking of links, any "copy link" is uncertain for users: sometimes it's a crappy useless popover, sometimes it's a link you don't realize the other user will need permission for, and sometimes it has copied without really notifying you. Awesome.
New teams is basically old teams but now your computer has twice the software and shortcuts.
Testing your sound setup requires a painfully slow call with the crappiest Skype-inspired bot, the test feedback itself being less than 30% of the entire time wasted
And the sound is just noticeably worse than literally every other service (Facebook messenger, Google calls, slack, discord..)
Once teams is on a computer, some magical shortcut (you will only ever press by mistake while doing other things) will pop up a window trying to get it integrated further into your O.S.
Searching for messages is extremely painful, there's no robust history in that bar at the top and you'll find yourself searching multiple times over sometimes, especially as you can't preview much so you try to find that one message from 6 months ago over and over again with new searches.
Setting appointments can't tweak the exact timing the way outlook's calendar does (down to 5min increments if wanted).
Can't pin more than a few teams. Good job making the tab that your app is named after the one people want to avoid the most.
I could go on but I'm not working today and already have enough sadness incurred by that horrible piece of junk 5 days a week..