All of this has integrations into each other. Somehow a slack bot can show me calendar entries. Why I would even need such a broken UI/experience is unclear to me. I can't see when people usually work. Meet chats disappear once the meeting is over.
At Teams/Outlook you have a million other issues, but all things considered, I preferred it.
SPOL is even worse a tirefire than, say, even Lotus Notes. And it's in Electron on top of that, so its 10x slower than a real non-browser application.
Ive only rarely seen Microsoft put out actual good software. The last time was Windows 2000. Now, that was some quality software.
Thankfully it no longer crashes Chrome all the time, but everything else is meh. I still can't tag people in Japanese. The security settings are a trap for poor quality system admins and checkbox checkers. The meetings crash, the screen sharing only allows one way (so no easy pair programming), etc..
I much prefer working with slack and google meet like I did at my last job.