Zardnaar
Legend
This is I think the main real objection people have to the ST summed up really well, and it also illustrates really well why the people who were upset by the ST really cluster in the Gen X and Elder Millennial age-ranges, and almost no-one under 30 got mad about them, because those were the people who had really clear ideas about what they thought happened after the OT, mostly informed by the books.
It's exactly as you say "too many changes from the book time-line".
I saw this reflected really well in my RL friend groups - the small number of people who were Star Wars book readers absolutely HATED the ST, especially TLJ (despite it being, on most reasonable levels, the best-written and directed of the bunch - indeed arguably the 3rd best-written and directed SW movie overall, after ANH and ESB), because what happens in the ST, especially TLJ, is very much in opposition to the books and their essentially "happily ever after" attitude (which many shocking events and Luukes and so on, on the way, but it always ends up good).
Not criticising you to be clear - I think it's really legit of you to recognise where your objection comes from.
I wasn't overly happy about them dumping to books.
More they ignored the lessons from tbe books in terns of what works what doesn't.
RoS for example was a bad knock off of Dark Empire. Dark Empire wasn't good though.
The basic idea works in both RoS and Dark Empire though. Clone bodies, use Dark side to transfer into them.