I think one of the things a lot of fans mistake is how movies get developed. You don’t draft an idea (a treatment) and then write it as a script and then film it. That id not what happened with the original film. In the idea presented you see the origins of Snoke, the First Order, and Luke in exile. Sure it is Maul, Stormtroopers, and Luke trying to find himself, but it is the same kernel of story that we ended up with. Trevorrow’s script similarly has the same general story beats as the final TROS. But for anyone familiar with how movies develop from idea to final film, these are all steps along the way. From what we know of Lucas’s ideas before he sold LFL to Disney, they started with his treatments and developed them from there. They changed things that weren’t working and kept things that did.
So under everything is the treatment that Lucas sold to Disney. You have a remnant of the Empire that is now large enough to fight back. You have their evil leader. The main focus went from mobsters and guerrillas to a well organized remnant of the Empire, which was the main focus of Zahn’s trilogy. But as we see, that was a piece of George’s idea. They dumped the politics that so many didn’t think worked for the PT.
Things that did not change:
A remnant of the Empire
Luke in exile
A new pair for the Dark Side (Maul/Talon not really sith to Snoke/Kylo not sith)
Leia is a significant leader
Leia’s son falls/fallen to the dark side
So the ST is very much based on what Lucas had in mind. It just was not developed from there by him. It was developed much as he might have. We can see that wide variety of options in how Empire and Jedi developed. Had Lucas done the ST himself, it would look nothing like what he has described because it would have gone through the same story development as the OT and PT did. So this idea that these tidbits are exactly what we would have seen is not very accurate. Same with Trevorrow’s script. That was the first draft and it would have changed before the final draft and would have changed even more during filming. So these pieces of development do not equate to what we would have gotten in a final film or trilogy. It is fun to speculate, but that is the same as The Star Wars comic adaption of the early script.