I'm not sure if they count as rough edges, but most common things I've come across tend to be security related and the limitations on a normal user. From (foggy

I'm not sure if they count as rough edges, but most common things I've come across tend to be security related and the limitations on a normal user. From (foggy) memory you can't sudo by default, and you also can't mount as a normal user. These things are probably perfectly reasonable choices to make for a secure server but annoying for a desktop. This may not count as desktop, but another annoying one is /usr/sbin and some other common directories being missing from the default PATH. Still, it's way less annoying than ubuntu's constant nagging about updates and trying to shove snap in your face.