you gonna have a hard time finding screen protectors.

Usually you cannot add ram sticks.

Some are really hard to fix, including battery replacement.

Pick a faction (wacom vs mpp) and stick with it.

Used dells can be really good for value.

Some are with tb3, you can play arma3 1080p@30 with a gpu dock on 5290.

Most detachable works bad on you lap.

Some 360 degree 2-in-1s, like x360-15ew, can only be powered on in laptop mode.

Linux drivers can be hits-and-misses. Weird bugs can occur.

They may not make phone calls in windows.