It’s all about a family in the end.
And that’s where the mistake lies in my opinion. The protagonist of the Saga is NOT the Skywalker family as a whole, the protagonist of the Saga is Anakin. George himself said it several times. Anakin is the protagonist of the entire Saga. The moment Anakin dies then the main film Saga ends, because its protagonist is dead and therefore there’s nothing more to tell.
If Leia is the Chosen One in a metaphorical sense (that Is, as the one who restores order in the Galaxy through her office as Chancellor), then for me there is no problem with It. But if she’s the Chosen One in a literal sense, then for me it’s an abomination. There’s only one Chosen One for me, and that’s Anakin Skywalker. Anakin is the Chosen One of the Jedi prophecy, the one who was born to destroy the Sith and bring balance to the Force. The Prophecy has been fulfilled, because he restored balance by destroying the Sith (who were a source of imbalance) and allowing the New Jedi Order to be reborn on the ashes of the old Order, correcting the mistakes made by the old Jedi, allowing the Jedi to live in a more balanced way with their inner self and with the Force itself. Any story that contradicts this fundamental truth isn’t worth of being told in my opinion.
I totally understand your argument about Darth Maul and Luke, but I believe that Darth Maul played his role in The Phantom Menace excellently, and that he shouldn’t have been reused after the film, except to tell stories set before the film itself. His return makes no sense to me, no matter how well it can be done and what the circumstances may be.
I don’t like the whole concept of the Whills. I prefer the Force continuing to be a mystical energy field shrouded in mystery. I don’t want to know how it works. I have nothing against the midichlorians, because their existence doesn’t tell us anything about how the Force works, but the concept of the Whills takes away all the mystery from the Force, and it’s something I don’t like. For the same reasons, I think the entire concept of the Mortis triad is dumb. I’m more than happy with the explanation given in the Darth Plagueis novel about Anakin’s birth, I don’t need a more detailed explanation and I was never interested in having it.