So....
Agree 100% that they should have had an outline plan and stuck to it. You can't just make it up as you go along. Why announce a trilogy if you don't know what will be in the trilogy.
Bringing Rian Johnson on was a mistake as we all know. However JJ didn't exactly setup a compelling story either. It was beautifully made, but the issue was there in the beginning. We had no information since the Empire was defeated, and then somehow there is this thing called the First Order, and a Resistance. But a resistance to what? Where was Coruscant - which was shown during the prequels to be the bright centre of the Republic.
The Force Awakens was empty. The Galaxy was empty. Not enough scale. Not enough depth.
The Last Jedi is a joke. It was made purely to subvert expectations. Rian literally went to 'Film Theory' on YouTube, and ensured that all his plot points contradicted all the potential story arcs hinted at in The Force Awakes. And if The Force Awakens was empty, then The Last Jedi hadn't eaten in a decade.
Some stupid lightspeed tracking BS. The lightspeed ramming. The dumb "we can't catch them, but they will run out of fuel". Literally before Fuel had NEVER been spoken about in the previous movies, and suddenly its a thing that can happen.
The ONLY good part of The Last Jedi was the Kylo / Rey connection. That was done really well. The rest is a waste of space.
Then JJ has to come back in and make the story make sense. I think he did a decent job considering what he started, and then what he was left with. My main 6 gripes with Rise of Skywalker are Evil Rey just for trailer bait, the stupid dagger being an outline of the wreckage from a certain point of view, Palpatine's plan made no sense and he flipped it to kill them both when they were together, the fleet of star destroyers all with Deathstar cannons, Chewie / Threepio dead / not dead thing, and the stupid medal for Chewie.
Other than that, I thought it told a better story than the other two, and had the main characters actually spend a bit more time together.
Finn was easily the wasted character of the trilogy. He could have done some really cool stuff, like led a stormtrooper rebellion. And John Boyega is very likeable too, so its a shame.
There was obviously SJW messaging in The Last Jedi. It was all over the place. Rose's character was delivering most of it, and that's why a lot of people didn't like her, because it wasn't subtle, it was in your face. I didn't mind that they wanted to add another character. I didn't like the way they did it, and what they used her for. I think people could have considered the greed of the casino planet and the war profits if the writing wasn't so lazy, but instead they were faced with situations that brought it to light subtly. Its also lazy writing when things are a certain way because two characters don't talk. The Holdo / Poe thing was not entertaining to watch - it was frustrating. If Holdo was a man or a woman makes no difference - the situation was stupid and amateur. This gets confused with SJW because Holdo was a woman. It's not. Its just lazy and terrible writing.
But lots of The Last Jedi had lazy writing stacked on top of more and more lazy writing.