Just legacy. I don't have a vintage deck (nor is it played that much at my lgs) and other formats are just too soft for my taste. I like to either do the most broken things possible or fight off those things rather than bitch about a 2 toughness one drop (mini-planeswalker or not) needing (and getting) a ban. 1-drop creatures should not be a problem, run some friggin' Bolts (Forked or regular) and Path to Exiles, problem solved.