My favourite example of this is how it handles audio devices. Every other app just uses the default Windows audio devices, maybe with an option to change it to something else if you want, but not Teams. It has to handle the choosing of the audio device itself. I once saw this lead to the fantastic situation where the sound in Windows was working fine via someone’s USB headset, but Teams decided it wanted to use the headphone jack built into their laptop dock as it’s audio device instead (no headphones were even plugged in). We manually changed it but it kept defaulting back to the headphone jack every time the dock was disconnected and reconnected! I can’t remember what fixed it in the end, probably just a reinstall or something but it was still a stupid and easily avoidable issue.