Unless you’re hanging a CRT you really don’t need to bother screwing into the studs. Get the right type of plug and you can hang some pretty absurd weights from drywall, especially if most of the force is straight down like it would be with a tv mount. I really like the screw-in type plug. Easy to install, no possibility of the toggle not toggling or whatever.

If you want to mount one of those extendo-mounts I’d probably bother to screw it into the studs though, to be fair.