An exposed hammer is useless with today’s firearms.
Unless you need to take that precision shot because the bad guy is shielding himself with your daughter. In that very rare case, a single action shot may be welcome over a double action shot.
“An exposed hammer is useless with today’s firearms.”
Why?
If you are using a revolver as a belly gun - a good reason for carrying a J-frame or SP101 - then a hammer has no purpose. But in an “active shooter” situation, taking aimed fire might apply. And then single action would be nice.
I’ve yet to have a hammer snag on clothing or anything else when drawing a gun. Maybe it is because I often prefer belt carry. I also grew up shooting single action revolvers. When I draw a gun, I cock it as I raise it to fire - and I don’t raise it until I’m ready to fire.
Also, an exposed hammer allows you to put your thumb behind the hammer when holstering a weapon, which is a good way to prevent “Glock Leg”.
PS: I have a Glock and it is OK. It has been 100% reliable! But I carry a revolver more often.