Deep down I think people who support merit caps on weapon skills are just afraid of having even competition on their favored jobs. They don't want to get shown up on their primary job by someone who just leveled that job as their 4th. That's why they want to convince everyone that you don't NEED that merited WS to play the job. They want to maintain the edge they gain by having it themselves. If it wasn't worth having then they wouldn't have bothered with it themselves.