It still a little mindblowing to me that teams steals focus like it does at startup. Windows boots relatively slowly that I could be in an Outlook window or typing in a URL or whatever after a fresh reboot and then teams just steals my mouse and keyboard. I've trained myself to not do anything until teams starts (and being an electron app, it certainly takes its time) because I'm so annoyed by focus stealing.
On my home computer the xbox application does the same but at least it loads super fast. I am just bewildered that in 2021 that focus stealing like this is so common and accepted by anyone let alone Microsoft. It just feels like scammy 2000s adware.