Conforming clothes are much easier, the cloth simulation takes time and produces unusable results from time to time. If the cloth simulator would be easier to use and faster (see MagnificientDesigner for example), people would use it more. But having to calculate a scene for half an hour just to see that the cloth went to the body and went boom makes people stick to what they know.

If you know what you are doing, dynamic is better. But it has a learning curve, and many don't want to go that road.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.