One thing I wish this can do is download the update, and apply immediately as soon as the app is closed, or just before the app is launched (there’ll be a message that says something like " is updating at the moment…").
That should save some time. The current message that says “pending update of <snap>. Close the app to avoid disruption” is a little vague. No indication whether the app was successfully updated. I just tried to close Firefox (running on beta channel) to apply the update, and relaunched about half a minute later. While it launched (slowly, FYI), update still didn’t apply (from 100.0b5-1 to 100.0b6-1).