Just because someone rights a nice, formal essay does not mean a greater post quality. They could easily lie. Now, you do have a point about it making ST perhaps "looking" good. Others who are passionate about weather, of course, could disagree, and take it the opposite direction. Elitist, overly strict, mean, weird, those could be some of the words they would be thinking. It's human nature to want to be free to join in discussions without any "proof" that they are worthy to join in. I agree, that as with everything, the essay has its pros and cons.
I think the biggest opposition is the crudentials for the essay. I have heard that only if one was a chaser, that they could join the board. Don't know if that was true or not.