A writer cannot misinterpret their own writing. That's like saying a person misinterprets their own opinion
Did someone mention The Phantom Menace?
I will pretend to know any character much, much, better than the author if their newest interpretation breaks narrative (or human) logic.
I'm not even a Star Wars fan, but I realized that portraying Darth Vader as slave is technically perfect, because he's a slave to his master anyway. "Yes, Master" how many times did I hear him say that in his deep robot/Jame Earl Jones voice? Then, for no apparent reason - from that point on - he's painted as an entitled, whiny brat, who's always gotten everything handed to him. He always gets what he wants, and doesn't have to listen to anybody. A typical "teenager" who's rebellious defiance of authority is only amplified by his inevitable pull to the "dark side". "Of course he has these qualities" We're supposed to think, "He's going to be the villain." As if a defiance of authority is an inherently bad thing... This behavior is not only inconsistent with his background as a slave, it's inconsistent with his
future as a tyrant, where a final act of defiance against his only superior is considered a redemptive breakthrough! I can't say, "George Lucas obviously knows something I don't" because I don't know that he does, but it doesn't seem like he does, and it was his job to convey that convincingly to us.
Bad writing, is bad writing, and we should have the guts to say so. Fiction is still written by mere mortals, last time I checked, and they definitely have to check
themselves from time to time.
Is Cloud's AC writing "bad" writing? Not
really? They've sort of reduced him to a caricature of popular cultural interpretations of him. But since (in the Compilation) we mostly got Cloud's early days when he was kind of a loser (in Crisis Core) and his later days when he's kind of aloof and down about losing Aeris, and learning about his imaginary life, and being Geostigmata'd, I guess they're telling us this is who the real Cloud is? He has found himself - and he's a
loser. Not the most fun way to approach it, but I guess it makes sense... Also you would think that saving the world from it's greatest threat, (the fallen childhood hero you thought you'd never live up to) getting to date your awesomely hot childhood crush, and then helping to rebuild society with your powerful, loyal, allies would be a confidence booster - but different strokes, I guess.
That is to say that even if it makes some sense, it may not be the
most reasonable interpretation of his character, or the development that he underwent in the original game. Then again, where does he have to go in Advent Children if he's well adjusted now? Square's decision could be based on something as simple as that.