To be fair it was a bit hard for people to get that "let the past die" wasn't the message since the movie had people surviving in space, using hyperspace like a weapon, Rey matching the Skywalkers in the span of 6 hours with no prior Force training, that Luke abandoned everything he stood for with questionable reasons to change his mind 5 minutes at the end then die because of "effort", got rid of the big bad with a gag, and then having the random ass kid with developed Force powers coming out of nowhere "eVeRYboDy cAn bE a jEDi nOW" as if the prequels hadn't shown that already except they had to train), and both the items representing the light side and dark side were crushed to pieces (helmet and the lightsaber).
The nail in the coffin was Kylo throwing out all his character development in the last 10 minutes to inexplicably revert back to murderous 12 years old.
Of course Rey becoming a Jedi, getting the books, and Luke quoting Ben proved the message of the movie was the opposite of letting the past die, in terms of philosophy....
The problem is that it still succeeded to actively kill the past in ways that many people could not get over.
So that philosophy was more a slap in the face than a hopeful one for the people that did not enjoy the film.
(And just so we avoid an argument about the film, I'm not saying any of these reasons are objective things that make the movie bad, there is no such thing as objectivity when it comes to Star Wars and that's fine, I'm just saying these are things a lot of people disliked that made it hard to move on and look forward to the future)
We could go meta and say that The Last Jedi destroyed a lot of things people cared about to make them crave the past so much that IX giving it back feels very cathartic. In which case I guess TLJ would be more interesting and acceptable than many people felt it was at release.
But that's not a thought I'll entertain until we see how IX concludes.
And personally the only thing I hope is touched up from TLJ is Luke's exile having a bit more to it. Again, TLJ lovers think he was great, but let's not kid ourselves, the number one complaint is Luke's behavior, so if they can throw us a bone there, I'm sure you'll be fine with it, and people can just move on and go back to enjoying Star Wars and having fun theories and stuff with the community, instead of being at war.
I hope to god Rey isn't a Skywalker though, this is too late to change who she is. There is nothing wrong with her being a strong "nobody", now that we have a time skip we can rationalize that she just trained really hard in between movies. No issue there. Forcing a lineage on her at this point would harm the character even more. I don't mind seeing her actual parents and why they abandoned her though. She needs closure.