"EVERY A body has this problem"

Where the door hinges wear, the door to sags. Then the latch post lifts door weight when the door is closed. It wasn't engineered/meant to carry any weight. Sure this issue is more common in 2 door cars, having longer heavier doors but it is not limited to one brand or body. How many of you have owned a GM product with a pizzy pull strap on the inside of the door and broke one end of that strap away from the door? They're all the same but different. We've never pulled what we grab off the inside of our doors. None are built like Sherman tanks.
Door hinges were supposed to be lubed regularly. Actually, The mfgrs expected the vehicles to visit to their service dept' regularly for routine maintenance which would have included door hinge lube.
My 67 fish is in very good condition overall. Credit goes to the previous original owner.