Quantity =/= quality is a weak argument in my eyes because;
- Quality in writing is subjective - this makes this a cop out answer. A lot of roleplaying writers, here and elsewhere, think their writing is god-tier awesome when really it's shit tier quality fanfic selfservice.
- Quantity is not inherently linked with quality but more often than not qualitatively great posts have a larger quantity of information (and therefore, higher quantity of words) than low quality post -- there is certainly a link between the two.
- Writing is not about quality, writing is not about quantity, writing is about how much you enjoy writing the post, and roleplaying is about how much you enjoy writing the post and how much others enjoy reading your post. If you are content reading one liners until 5 am in the morning then I'd say that the roleplay hits the perfect spot for you. Personally I can't do that because it doesn't interest me. It's not a quality I look for in a roleplay.
- Subjective and personal take that come from my own experience (i.e. anecdotes) but the people who put QUALITY IS NOT QUANTITY REEE at the top of their interest check are also often the same people who write a small paragraph that parrots exactly what your post said without adding anything new to it. Quality =/= quantity, sure, but your post has neither. I'd rather read purple prose than a rehash of what I already wrote for you.