Q:

Why do we screw doors into the doorframe rather than the studs?

I just finished fixing my door to my garage, which would not latch because the door had sagged.  The final remedy was to drill the holes in the hinges deeper and put 2" long screws into the frame to pull the door level.
Why do we rely on little tiny 1/2" screws that strip at the lightest insult?  Why don't we just start by attaching the door right into the frame and forget about all of this saggy door stuff?

A:

Properly installed, at least some of the screws should go thru frame and into studs. The short screws are mostly there to keep everything aligned while a pre-hung door-and-frame set is assembled and shipped. Once it has been hung and shimmed properly, those screws can be replaced with better ones... but aren't always.

