Hands down, but to be honest all mechanics really do ( and what one should expect it to do) is that they distract players from roleplaying. So we could aswell ask why there is even gameplay mechanics besides some basic functionality that helps roleplaying and creating immersion eg. placing probs? I mean, hell if you wanted to roleplay why go grinding? So obviously the answer is that while PS is first and foremost a RP, it's a game aswell.
Now, of course that does divide some people. There is those who don't roleplay at all and those who only roleplay and everything inbetween, making the distribution even. Or so would you think. Based on what you're talking, distribution is more leaning towards mechanical players at the moment.
The thing is, when we have every type of players in same server, we get larger distribution. So if we had two players instead (non rpers and rpers for example) we would have way less distribution on each server, making it easier to everyone to know who is a roleplayer and who is not. Instead of two servers, we can limit the current server aswell. So why wouldn't we enforce RP more hard? Like, why would we even really consider those who don't want to roleplay. i'm not trying to discriminate non roleplayers, but the thing is that when we have 1 server trying to serve 2 totally opposite types of players at the same time, it only ends up serving both types of players more poorly. And if the resources are not enough for two servers, i think our only chance is limiting from other end a bit. Enforcing RP is not bad IMHO since the game is supposed to be first and foremostly a true roleplaying game (go ahead and correct this if i'm wrong).