yeah that makes sense if they have the time but lets just pick on batman for one...in hush he fell in the gotham harbor, and all of a sudden mini propellers come whirrrrling out of his boot heels, so he doesnt have to waste energy diving, he just shoots thru the water.
or when he's in gotham searching for the joker buts runs into clayface, he jus so happen to have freeze pellets in his belt for that ass.
or when spiderman used to whip up a special batch of web fluid, just for morbious, b4 he even suspects him in an attack