The ask is not really to have a snap never update. The ask is that you have the option to update only after a user allows it. This has the side effect that if the user never says yes, the app never updates. However the true goal is that you are in control of when your apps update. This has many benefits, I 'll only list two. If something breaks, you can immediately deduce that it is because of that specific update, instead of having to investigate your whole system on what's happening. Also you can always say no to updates on the day you have a presentation so you have no surprises.