Yeah door locks are maybe 6-9 inches higher than the level of a desk but you have to crouch down to be at eye level with them so you can pick them.
Or you could borrow the magic chair that apparently appears at a terminal when you hack it whether there was one there or not when you snuck up to it....
I get what you are saying but I can see why Bethesda might feel that hacking is less stealthy than picking locks.
I obviously enjoy stealthed bonus damage VATS headshots too much