Hmm... if you're touching fretboard when playing, you're pressing too hard. It's not "proper" to press that hard, scalloped or not. Well anyway, scalloping forces you not to press too hard so in a way it "teaches" you to play with a light touch.
I forgot to mention the benefits. For me, there is a lot less friction (with the fretboard.) I guess you have to try it to really understand the benefit. By trying it I mean for a good amount of time (weeks?,) not just trying a friend's for 10 minutes and saying "This is weird, I don't like it"