If you don't run it on your main machine this becomes pretty annoying pretty fast, and there doesn't seem to be an option anywhere to change 'mark me idle after' time
I've missed soooo many notifications because of this garbage I have to remember to manually go check it.
Didn't occur to me that 'idle' would cause messages to stop coming in
My experience with Teams is that it uses by itself about double the RAM the rest of the entire operating systems is using (and that includes a web browser and a office suite).
They've recently used tricks to reduce the RAM usage, such as practically unloading the entire "tab" (in the Chromium sense) when the window is not focused, but this leads to out-of-date information in the window (such as presence status) whenever it is not focused.