It's a fair question to ask, although I wonder about the motivation for asking. How many people actually do wholly immersive RP? Would those people still play and contribute in more flourishy ways to EVE RP if they didn't do immersive RP?
My impression has always been that there's very little wholly immersive RP in EVE, so it doesn't move the "centre" of things much. It's possible that that's just because I see it through Evanda Char's position document for EM. As she expressed it, there were plenty of places in EVE for RP-lite, and very few alliances (possibly down to only one) for immersive RP, so protecting the immersive RP environment of EM did take priority over most other things.
The motivation would be that I'm not sure whether I feel the issue is there's too little immersion (and the RP that does happen gets cheapened for everyone socialising with everybody else) or too much (and this impression of needing to throw in which an existing group arises).
Historically, perhaps as a function of me first RPing, both in EVE and ever, with RE-AW, I've preferred immersive RP. My experience with Vaun has been that without sidling up to an established group, the RP he gets goes between "difficult to find" and "nonexistent", though, so perhaps now I'm questioning that.
Immersion-with-concessions-within-reason might be a decent summary of what I'm starting to feel, having watched RP corps without being actively involved: do the usual stuff, but if attacking an RP group is only a
little out of the way, as opposed to the other end of the cluster, if they're a target the reasoning to go for them can be concocted. I don't know; it just seems slightly sad, from afar, that RP groups who are reasonably matched with every justification to attack each other don't. That might just be me being too little (or too much) of a purist, mind.
Y'know, my impression is that some of the closed circles have really interesting characters (and players) in them, and that there are often immersive reasons why they can't play together much.
Therein lies my issue. There exist interesting characters -- but because they're so insular, approaching them often ranges from difficult to impossible without extensive handwaving.
(Although this is interesting, if there's further interest in it it might be best split into another thread, since it seems to be going down a slightly different route to the OP.)