Ball peen is an engineers hammer , a claw hammer is for carpenter and a sledge hammer is for both If all else fails get a bigger hammer is pretty used phrase in the millwright /machinist world. (block your ears Gus) I think the ball end was originally used for rounding the shank of a rivet over. The head was support by a back-up bar and shank hit with ball peen to form another snap head (half round ball) on the other side The rivet material is ductile and soft enough to be formed by hand hammer blows.
Using then for making gasket is common in the maintenance field where sheet gasket material is used rather than cut gaskets. The remote sawmill with one millwright to keep the place going would use what was available rather than try and stock all the parts needed.
Once you appreciate the use of different types of hammers you have moved to very slightly higher level

of understanding in the metal trades.
Good hammers are a joy to use, the feel and balance fit the hand and the right amount of force can be applied with great precision. The reason the ball peen head is not good for nails is because it has flap head where the claw hammer usually has a small crown on the head. It just doesn't feel right to use a ball peen for nails so you just don't. The small crown allows the head of the nail to be driven flush with wood surface without actually hitting the wood with hammer head and leaving a dent in the wood.
Gus, you keep the little Starrett hidden from my view.
Thanks jb