First, reinstalling however many times won’t solve the problem of not having CMD+Q safety feature like Chrome and FireFox has.
Second, why I have to keep login and log out of iCloud just to let tab group works? What if I have to wait minutes or even hours after each log out and log in if such issue persists? Yes I tried that before and no it doesn't solve the problem.
Third, if Apple’s engineer is so incompetent that the only solution to any problem is login and logout and/or reinstall everything, they get to take the blame, not the end user. If Apple doesnt value customer’s time, then end user should not value Apple’s time either.