This is not an idea but since you think a bug fix is an idea here goes. Between my Teams app on my laptop, Teams icon in the task bar and my Teams app on my mobile device none of them appear to tie up. It's almost impossible to reliably know if someone is available. I don't want to know when they were last visible or I last communicated with them I want to know their status. I would have thought that an individuals status would be synced across all devices without any 'lag' what's the point of moving to the 'always on' internet/cloud of things.