Well personally I couldn't care less to ""disservice"" for fictional characters. I want a enjoyable story that convey my emotions, twist my expectations and provide me fun while still making sense from narrative standpoint and world building. The only movie on SW new trilogy that fail in that criteria is the last one, where you had Palpatine creating an army out of nothing and destroying the same navy only with their thunders
That's said I 101% disagree that new trilogy did any older characters disservice, watching them I only saw respect and nostalgia from the visual effects, to the plot, to the art direction, character design, world building... that is in reality an access of nostalgia and east eggs that kinds blocks the trilogy to run by their own legs
About the old cast, they are all treated by the plot as important, key characters. Their presence all have plot significance, they aren't just "there" as luxury third tier characters
The problem is for fans those franchises are more than something to have fun, they are like a cult, a religion. They hate anything that deviates to a set of principles they already defined and believe to be the essence of the franchises
Han Solo always needs to be the smartest guy, he can't be foolished not even by the son he loves, raised and truly believed he could turn around because God forbids for a dad to believe in his children. Luke is a legendary master Jedi, he can't make mistakes let alone have weakness, he would never be deeply affected by the lose of his students, or losing faith because Luke is like Jesus and Jesus is flawless
That's the reasoning of the average SW fan. That's why they will never enjoy anything related to the franchise the say to love. They raged over prequel trilogy, raged over new trilogy, raged over Solo spin off. I'm sure they will just hate the next trilogy as well
I think you are taking it a bit further in that last part, it's true that there are people that treat the franchises they like as a religion thinking that everything in them is perfect, putting them on a pedestal while being incapable of doing a serious analysis to really gauge if everything is as good as they think it is, and there is also the contrary group that thinks the opposite of the same franchises always treating them like they are atrocious products, the lowest of the lowest, incredibly badly done or that they don't even deserve to be analyzed or reviewed dissmising them, but behaviours like those two extremes are what some fans of TLOU2 an SW sequels were taking when defending them, not against hardcore fans, but against normal people in the general public, people that while not thinking they were utter trash, they thought that their stories weren't anything innovative, game changing or to be in awe for, and sometimes that they were inconsistent, lacking or were reaching borderline incongruence, that the new characters introduced were plain, uninteresting, badly executed or nothing memorable, and that the old characters were used or represented in ways that not only are bad or contradict their previous characterizations in some ways challenging the structure of things that have already been established in-universe, almost antagonizing previous entries in the series, like if you are gonna change things like that then why are making direct continuations in the same universe in principle?.
When you say that you don't care about "disservice" for these fictional characters, is almost as if you say that you don't care for the experiences the characters had lived, despite how rich or compelling they could had been contributing to the story and its unfolding, if these experiences helped shape the structure of the universe or if they made everything more engrossing as a whole, then simply the fictional characters could die by slipping on a banana peel despite anything that came before whether said death it's incongruent or not; when you say "I want a enjoyable story that convey my emotions, twist my expectations and provide me fun while still making sense from narrative standpoint and world building", guess what, lots of people didn't find those in the SW sequels nor in TLOU2 or other sequels of already established franchises, not only the diehard fans.
Like, critics didn't find SW prequels good and cultist SW fans don't like anything other than the original trilogy, but lots of people from the general public and new people introduced to SW do, they liked the incredible music, the amazing lightsaber fights, the jedis, the more knowledge about the SW universe structure and many other things, for example, lots of the people i know like family, friends and neighbors even if they are not complete geeks to know everything about SW, can remember several important things from the original trilogy because they are iconic, and from the prequels not only they liked things like the ones mentioned previously they also got to recognize and remember the charaters like JarJar Binks, Qui-gon Jin, Darth Maul, Padme Amidala, Mace Windu, Anakin, Count Dooku, General Grievous, or the names of the planets etc., instead when i ask them if they remember the names from the characters from the sequels, my mother for example only knows that the protagonist is called Rey but didn't like her character much, she kinda liked the acting from John Boyega in the first one and the performance from Adam Driver in the last one, but she can't remember how the f their characters were named, and she just refers to Adam Driver's character as "the idiot son of Han Solo", oh and that the spherical robot was named B-something, from there we have the completely forgettable pilot with also a forgettable name, accesory characters here and there in every entry, and scrapping the bottom of the barrel we have the unlikable and later deleted character from the mechanic girl from the second one, the general or whatever woman with the purple hair doing totally unlikable things until she dies doing the incongruent "hyperspace jump" crash on the enemy float, and finally we reach the completely waste of space and movie time: the girl captain of the stormtroopers that doens't serve for much in the end, and also the deformed parody of a Sith that was a complete nonsense, or the blonde soldier dude that kept screaming like an idiot, i clarify not my words, those are things the people i know say about the characters in the sequels, so no, not only the hardcore cultist fans disliked those movies.
As an extra i'm also not against a realtime action combat FF, it's just that FF has been up and down for me on history and characters and other things since FFVII, and so the last one FFXV felt like an incomplete game.