I shoot stills, and m4/3 is fine if you don't take it beyond its performance envelope, which is actually fairly large. I think being a snob on FF for stills is no different being a snob on LF back in the days when Oskar Barnack came up with the Leica I in the 1920s. I remember reading about how people would disparage Barnack's idea in similar terms people harp on companies not using "full-frame" sensors in all their cameras because they "too small" for serious work.