Some of the things that annoy me re: snaps are:

1. the update process is separate from the main system update -- "close this program to update, or will forceably update in X days" notifications;

2. breaking desktop file links where an update can create a duplicate file and after the old snap is removed it removes your pins to the taskbar;

3. possibly breaking other things due to the way the snap directory for the app is not stable.