The really annoying thing about snaps is that they pollute the mountpoints on the system. I’ve had as many as 100 mounts on a box after installing just a few snaps, which is super annoying if you ever want to try to get an idea of disk usage. God forbid you want to figure out what lvm volume can get shrinked.

There’s also not as much screening before an update is allowed, as there would be for the default Ubuntu repos (considering that 1-2 years into a LTS release you’re probably bringing in dependencies from PPAs anyway, I don’t know if this matters much).