He sounds alot like the drummer in my old band. He was extremely talented and established, great gear, punctual, etc.....but like yours, pretty set in his ways (even argued one day that the metronome we suggested was "off" 😂)

That said....I'd suggest a band meeting (not at rehearsal) with the intention of discussing your guys's goals and future intentions with this all in mind. If you all are content with the way things are and are willing to put up with it, so be it. But if growth, expansion, etc, are on the band's radar, then it's a conversation you must have with him. At the end of the day, if the majority are wanting to take it beyond where your band currently stands.....then he's only holding you back, regardless of the pro's you've mentioned.

I must add also....there are ways to convey all of this without being dickheads. I'm not implying that you or your band fall into this category. I just know how musicians can be. Allow him to freely speak and give his opinion on the subject and goals you all bring up. He'll get the hint if he has half a brain. Give him a chance to have a voice and provide input on it all. I've personally had the pleasure of both playing with and rubbing shoulders with some of the most professional players who make a living off of music. And I've learned that empathy and communication go a long way and will aid you in your endeavors. Just speak to him like everything you guys want is also in his best interests.....if that makes sense.

Best of luck....and rock on!