I could make a statement about declaring an entire work to be invalid based upon a single point, but I wont. I could also make a point about you misquoting the actual point to make it appear worse than it actually is. The point that he made isn't that it's worthless because Finn didn't leave him without spinal damage, it's that it's worthless because it's a setup with no payoff. You can say that, subjectively, the fact that the setup had no payoff didn't lessen the impact the two movies had on you. The fact that this setup had no payoff can be objectively said to be a flaw due to the fact that, in the previous star wars films at least, protagonists getting injured by lightsabers left lasting physical effects.
Night touched on this very well but since you're responding to me, but I might as well respond.
It's worth noting that you didn't actually provide a single argument that was made and explain why it was objective and good, just asserting that it was really good objective criticism. I also did watch the next bit involving Luke, which complained about the lightsaber throwing scene because it was "intended to be comedic", nitpick parts of it that weren't even issues in the first place ("Why was Luke in that location at that time?") and say that it would have been better if instead of throwing away the lightsaber he'd simply let it fall, despite the throwing moment actually being really important as an introductory moment to the character. I thought that the first example sufficed.
Like, I genuinely have far better things to do in my life, both things I have to do and just... like, for fun, than sit through even 10-15 minutes of a nitpicky Star Wars critique that is far longer than the run time of the movies and takes him far too long to even get through a single scene, especially when I have in good faith tried this every other time I have gotten burned. So I gave the maker a shot- I didn't pick any particular point in the video that would make him look bad, I jumped to a random point and see how he argued and what his arguments were. Both failed to impress.
And I completely disagree. Now, part of his point absolutely was that the setup had no payoff; that was what he engages with when he responds to the idea of it being "subversive" (which is a strawman, nobody says that was one of the things Johnson subverts because as noted, it isn't a subversion), but the key thrust of his point is that it is meaningless in the end because there was no lasting damage, and as a result there is nothing to learn from, or nothing to remember it by; indicating that as a result it must be narratively worthless which completely negates both the narrative worth it had in that moment, and any narrative worth the event might then proceed to have later on in the story as a result of the thought and motivations behind making the choice that got him injured in the first place.
Directly, crippling consequences for an action are not the only way for an action to have narrative worth or for them to have residual memory beyond that scene or even that movie. Which turns the whole argument into a ludicrous statement that, again as noted, runs contra to literally every other equivalent scene in the franchise. Which leads one to the conclusion that maybe this criticism isn't particularly objective at all.