Here is an old, badly fitting UPVC door. It was sagging badly on its hinges and hitting the frame so it wouldn’t close. The hinges were non adjustable, so the the only option was to remove the glass and repack the door panels. By packing the panels on the diagonal (heel – toeing) it shifts the door back into square with the frame.
Composite and aluminium doors tend not to sag. If these doors are hitting the frame it’s normally because the hinges have dropped, they weren’t fitted correctly to begin with, or the house itself has settled.
If a UPVC door is not adjusted it frequently leads to the multipoint mechanism breaking. That can leave the door jammed shut or you can’t lock it. That can be much more expensive than getting the door correctly aligned.