I am personally not a fan of OOC masq. I know not everyone who has the 'You can't tell who or what my character is!' on their wiki is trying to be twee, but so many who do are that I just find it tiresome.
You know why I want to know who/what your character is? RP Hooks. It makes it easier for me to figure out reasons for us to RP.
Because jesus. fucking. christ. am I sick of spending thirty fucking minutes on channel trying to come up with how we can RP together because you're too goddamn lazy to put effort into it. 'Let's go here to RP' 'Nah, I wouldn't do that' 'How about..' 'No, that doesn't make sense for my character.'
Add in someone who is 'a mystery!' and they won't give you shit to work with.
I know on 'OOC Masq' games people are meant to just wander around the grid, but I'm not that kind of person. I don't wanna just wander or lurk.
So I see someone who is being 'sekritive!!!' and I just think they're someone who either, a) is really, really boring and can't think of anything actually interesting about their character, or b) thinks they're way more interesting than they actually are.
Telling me what faction/sphere/whatever you are gives me instant ways to hook in to your character so we can RP. People who use that info for mechanical advantages are problems.
And you know what we do with problem players? We show them the door. (Or we should.)
I'm personally tired of policies that hinder collaboration and RP made in the spirit of hindering problem players rather than just getting rid of the problem players.