Most interior designers like to hang pictures so the tops of them are even with the tops of the windows. A smart carpenter would either let a strip of plywood into the studs at this level (say a 6 inch strip around the parameter of each room) or nail in blocking between the studs at this level. I however am not a smart carpenter
In my addition I let plywood into the studs around the toilet for the toilet paper holder, a future grab bar and a 4 foot square sheet above the vanity so she can attach her external medicine cabinet to it easily. Now when I say "let in" I mean I cut my studs back by 1/2 an inch and put plywood in there. That way the drywall can be run right across the plywood, but screws can be placed anywhere and still get grip.
I have no intention of traveling from birth to the grave in a manicured and well preserved body; but rather I will skid in sideways, totally beat up, completely worn out, utterly exhausted and jump off my tractor and loudly yell, "Wow, this is what it took to feed a nation!"