It isn't pointless when it's done with purpose. It's a very effective skill.
Can't remember many players who do it with purpose, they just do it coz look I can step over. Take Ronaldo for example, he would not be any less of a player without them.
The last bloke I can think of who did stepovers well was Zidane, Messi is as good a dribbler as any and he doesn't really do them.