I'm not sure I know exactly what you mean by "the MMA community". As you say, my experience with most actual MMA fighters and coaches is that they are pretty open minded about anything that works.I’ve noticed an issue with the mma community, if you start discussing anything that isn’t judo, muay thay, wrestling, bjj, boxing, kickboxing etc you immediately get attacked.
this again just the community, the people who actually teach or fight are way more open minded. Guys like Anderson Silva learned Wing Chun and JKD, Roy Nelson does Kung Fu, Yi Long is self taught in Shaolin, Eric Paulson has done it all from Kali, JKD, judo, savate, shooto, BJJ, boxing, etc. I saw that at Gokor’s gym he is offering wing Chun classes, and scrolling through YouTube I saw that they had Stephen Hayes (Ninjitsu) at the Pit, the same pit Chuck Liddell trains at.
the point of this post is the following, a true martial artist should keep an open mind, not just take what a master or teacher says, it’s easy to listen to Rokas or Ramsay Dewey, guys who have no real success in the game and find out for yourself.
I do have to disagree if you are placing Rokas or Ramsey Dewey in the category of people who would attack you for discussing anything other than "judo, muay thai, wrestling, bjj, boxing, or kickboxing."
Just offhand, I can recall Ramsey Dewey showing techniques he has incorporated from Capoeira, telling the story of the time he got his butt kicked by an old Tai Chi master, and mentioning the time one of his students (who had an Aikido background) pulled off an Aikido throw in sparring that he had never seen someone pull off before. I've also seen him speak approvingly of a variety of other arts.
Rokas has posted videos challenging practitioners of arts not known for sparring to send him footage of their systems actually being used under pressure - but he has then posted follow up videos where he shows the footage he has received and shown respect for those practitioners who actually demonstrated sparring ability. I exchanged a couple of messages with him back when he was still in the process of trying to make his Aikido work and hadn't switched to a full time MMA focus. I found him to be extremely polite and respectful.