I would like to thank you. I've been role playing for some ten years, and I am currently in college with a creative writing minor. I have been trying to explain this phenomenon to people for ages. I think that your argument is golden, and I will personally be directing my fellow writers to your thread to read this. 

A 2000 word post that accomplishes one action with very little progression is garbage.
A 300 word post that wonderfully builds the story and transverses quite a bit of action, is advanced.