Umm, they've destroyed all the characters and themes from the original, shat on them pretty hard. Rey killed the Skywalker line, among other things, and you can't kill the past more symbolically (and literally) than that.
Johnson had zero involvement in Force Awakens or Rise of the Skywalker, they are irrelevant to this. As far as Johnson himself, aka the person that wrote the line, I've really never seen any evidence from interviews that he was trying to say that the line was meant to be taken as something people should do. TLJ was utter garbage, but nothing about it screams "we should kill everything in the past". If anything, it does the opposite. Even what happened with Luke, as dumb as it was, seems to be more about the idea of relying on myths and legends to solve your problems. Luke even used his own legend to distract the First Order and give the resistance time to escape. If the line was meant to actually be something people should do, it would have come from one of the heroes, not the primary antagonist that spent the entire movie trying to manipulate and turn the primary protagonist.
Edit: On the subject not "Not Trek". I was reading people's thoughts on Twitter and there was an observation made that I think fits perfectly. Modern Trek is more Battlestar Galactica than anything else. The tone, the characters, the language, a lot of is drawn from what BSG did. BSG's popularity completely changed modern sci-fi (for the worse).