I don't think it's shallow. I find it hard to carry on an RP with someone who leans towards a Free style - they give you nothing to go on, which is fine occasionally but if they only do the least response possible it gets very tiring. I did an RP where I would write several paragraphs, admittedly for two characters, and the response was about 1-2 sentences. Nuh-uuhh! When I helped moderate a few RPs I usually asked for a couple paragraphs at the least - I don't think it's asking too much.