Whether or not they're less practical depends entirely on the type of skirt, the type of pants you compare it to, and the circumstances you're wearing them. When it's hot, skirts are generally more practical, simply because you don't have any fabric crunched up between your legs. Many desert cultures know the value of robes for men.

In any case, I'm a big proponent of all types of clothes being available for everybody. Wear what you want.