It looks to me like you simply didn't understand the movie Franken Berry (great username btw, lol) or that maybe you simply don't want to understand it. The "point" of Luke facing Kylo as stated by both the director himself and the film's on-screen narrator (Poe) was for him to simply stall the FO long enough for the Resistance to escape. You're trying to make it into this big convoluted mess for no other reason than you apparently hated the previous set up leading up to it.
Johnson thought that a viable explanation for Luke sitting out TFA was that he had cut himself off from the Force on account of guilt/despair over not preventing Ben Solo from becoming Kylo Ren. He spouted a lot of BS to justify his actions but in the end came to his senses and helped the good guys in the only way that he could. Johnson didn't want Luke to die violently and he couldn't kill Kylo halfway through the trilogy so he came up with the idea of Force Projection which solved both problems. The end. It really isn't convoluted. At all, lol.
Johnson also said in an interview that the Canto Bight sequence was something he created because he "wanted a new environment that was like dunking your head in a cool bath of water, right in the middle of movie. Apart from the prequels, all the touchstones that make something feel like Star Wars have to do with griminess and dirt. I wanted to do something completely different."
I would argue that the Canto Bight scene was also an egalitarian screed. Would your response be, "No way! The director said that he simply created it because he wanted something like dunking his head in cool bathwater! That's all it was! Cool! Bathwater!"
Use your brain.