and arguably very many more of us like the reassurance of that popup.
Nevertheless, your system, your right and your choice ... unless the day (I hope it won't) comes that you need to post here to complain that your updates stopped and you did not know it had happened.
By the way, I think that disabling avast sounds will also not disturb you (other than visually) when avast detects a virus in any of its scanner functions ... not that I wish to disturb you.