Since you're the expert on insecurities, what do you think about folks who feel the need to interject their experience at "fight gyms" into online discussions? You sure did a good job on that straw man about no woman anywhere ever being able to beat up any man, ever, though. So I guess I'll take that back.
Maybe you should watch the fight from the finale again, though. Rey doesn't overcome by "using the force" or whatever. She just manhandles the guy, who probably nearly doubles her in weight. In the coup de grace, they lock up and she overpowers him and just pushes him down -- like a sumo wrestler would. It looks like something from a cartoon or a cheap action movie. If you're okay with that and the rest of the movie's mediocrity, great. You got the movie you deserve. Plot, suspense, originality? Nah. Forced diversity, false empowerment -- and explosions! A mediocre superhero movie aping Star Wars.
Anyway, set aside the physical absurdity of it, and the bad plotting -- the ending still sucks if for no other reason than it being a terrible setup for the next movie. Good luck convincing anyone to be afraid of Darth Millennial after he's literally been beat up by a little girl.
I felt that it was necessary to establish my credentials as someone who has actually trained against abled body women.
Assuming that you are able to accept the other implausibilities in the Star Wars Universe, it's telling that the parts of the movie that really seem to bother you are 1) what you term "forced diversity", and 2) False empowerment (of a woman). You are not bothered by these because they are inconsistent with the Star Wars universe, but because they reflect on points of view of our universe with which you are clearly uncomfortable. They are what you see in the Rorschach inkblot.
Let's examine both of these in the context of the Star Wars universe in particular, and the science fiction/science fantasy/space opera genres in general. In the Star Wars Universe, who knows what "diversity" means. The majority of "humans" could be black, or "latino", or "Asian", whatever that might mean. So, "forced diversity" is simply something that you perceive to be jarring because of your earthly political views, and not something that is jarring because it doesn't make sense in the Star Wars Universe. The woman physically besting a man? In science fiction and fantasy ation sequences, NOTHING, not a thing, except for that fact that limbs move, is realistic. A woman being able to push a man down is considerably more realistic than any martial arts choreography, including stuff that is supposed to be "realistic" and "gritty". So, is a woman physically overpowering a seriously wounded man (and this is stressed over and over again) implausible? Perhaps. But it is far from the most implausible action sequence in the movie. I mean, Storm Troopers are supposed to be the best soldiers, but in every movie, they are cannon fodder for a bunch of not particularly well trained civilians. They also seem to lack the ability to move and shoot, or fight with any sort of tactical competency. But no, it's Rey overpowering Ren Kylo the one that really irks you.
I don't presume to think that I'm going to change your mind about anything, but it's my sincere hope that you think about it a bit, at least.