Ok, now we are going to go Star Wars geek full throttle
AFAI can tell, Ben and Yoda were still stuck in the dogma, but at the same time were not pushing the heavier dogma "don't hook up". They still had a tendency to go Spock with the need to save Luke's friends in Cloud City. Yoda still thought Luke was too old and more or less had reservations the same as he did with Anakin. But they also seem to have lightened up or at least focused on what they felt was relevant still and disregarded the questionable parts. Luke was the transition, starting with the basic fact he was the offspring of a Jedi. So I'm not so sure Luke and Rey have to make changes from the PT. They already happened. And not as a plot hole, but as an actual plot device.
Some things to consider with the PT foundation.
Anakin did notice the flaws of the Jedi. It wasn't all just emo whine. He had relevant points. He also had to suffer through it in silence. His only true sounding board was Padme. She wasn't just a hook up. She was also his therapist. When she became pregnant and he started having the premonitions, he couldn't talk about it to anybody except the person that was also the focal point. He couldn't get the much needed outsider perspective. This would be weighing on anybody.
When Padme was gone, he lost his sounding board. Palpatine was not the father figure he had hoped for. He's almost like an abused child at this point. Nowhere to turn. Staying is hard, but leaving might be harder. And he had to suffer and brood in silence (worse, he had to bury his thoughts as well). When Palpatine was killing Luke, it was 1000x more effective watching him twist in silence. I wasn't even 10 yet and I knew what was happening. It wasn't just about his love for Luke, but it was the final straw that let him know that Palpatine wasn't just a dick, but Palpatine truly had absolutely no respect (or love) for Vader. The whole "Noooo" didn't change the ultimate conclusion, but ruined the theme of suffering in silence ... for decades.
And as far as the Jedi flaw and Anakin's conflict for noticing it, when Palpatine talks about dogma and a larger view (not running away knowledge, but making that decision on your own) no matter how evil the dude is, the audience and Anakin are thinking "Dude's got a point."
I could probably keep extrapolating, but it all adds up to the Jedi being flawed wasn't bad writing. It was 100% intentional. And from a removed audience perspective, it seems dumb. How could they not see this coming? Kind of like Nazi Germany and about everything else gone horribly wrong in history.
In conclusion, I think Luke is already free to get some stank on his hang low (that's an old one). And it wouldn't be in conflict with Ep. 1 to 6. It would actually be validating them.
Or maybe not. Maybe I'm just an idiot and Plinkett is a genius. (Puts on Space Cop. Hmm. I might be right.)