i agree that sometimes, the importance of keyboardnists are played down...yeah.. my church band have keyboardnists, and sometimes, they do add the fun in, and of course, it really depends on the bands themselves.
some guitarists like things to be their way, some vocalists do it too...[limp bizkit?] and some, other musicians like it this way, like it like that.
i believe for DT, they had a disagreement, and the keyboardnist left...[correct me if i'm wrong] .. but one thing i know, is that you shouldn't just assume that all keyboardnists are like that, all guitarists are like that... that way..you're just stereotyping everything...
and in a band, there is a need for a leader, and of course, a sense of team-work. if there's no chemistry, why should they be together in the first place? you see...we guitarists value keyboardnists to a certain extent, but certain genres of music requires different virtuosos' showing. on keyboard-based songs, of course the keyboardnists are THE main ones...its just like drummers...they're always in the background, but that's their job..and if you're good enough, you'll get noticed.!. maybe, its just that guitars are usually the main instrument, and of course, being the main player gives you different rights, and if they are the appointed indian chiefs, then give them the rights of one, and if htey appoint themselves, kick them out? why not?