What reason is there to care about the new situation and characters?
My problem with the ST was they came out with the original 3 as senior citizens and 3 random new characters. I think they did themselves a huge disservice by throwing away the Extended Universe, at least the Animated Universe. Dave Filoni, the guy in charge of Clone Wars and Rebels, created some very compelling characters which had good backstories and loyal fan bases. Use them instead of Rey, Finn, and Poe. They had so much story to tell that we never go to know much about these characters. here is my take. the only flaw is you need to know the basics from the cartoons.
Replace Vice Admiral Holdo with General Hera Syndulla
Replace Poe with Ezra Bridger
Replace Finn with Sabine Wren
on second thought, you could keep Rey
there, the problem with backstories is fixed. Also, you are able to stop away from the Skywalkers and truly open up the Star Wars Universe.
p.s. I haven’t seen ROS so I can’t comment on The Knights of Ren, but in my take, you could also scrap Kylo Ren and replace him with Darth Caedus