Honestly his character arc in AC never bothered me. One of the things the writer (nojima right?) and nomura did “right” was to have our protagonist start from the bottom and let his journey bring him back up. One of the things I learned in screenwriting class is the ending for the hero or protagonist must be the opposite of how he/she started out.
It’s no different from a character like Rocky. Starting with 5 and all the way to Creed 1, Rocky for all intents and purposes started at the bottom and has to climb back up. Some may not agree with the direction as 4 left him in a happy spot…but you gotta give something for the audience to root for.
For Cloud, maybe the mopey, emo angle was a bit too much…but you gotta remember, it was Nomura’s directorial debut. He took the hero’s journey trope to its max…..aaaand ran it into the ground with Clouds appearances in KH, Dissidia series, the anime specials and so forth. And that unfortunately became Cloud’s persona for a long time, until Remake of course.
But yeah, his arc in AC never bothered me. Clouds always wanted to be strong enough to protect those he cares about. Getting hit with geostigma, a one way ticket to death, made him reflect on his life. Failed to keep Aerith safe, and now the orphans are gonna die to geostigma…I dunno, it seems logical for Cloud, an emotional guy to begin with, to feel remorse, regret, sadness and pain.
That being said…Nomura’s insistence on keeping Cloud that way AFTER AC was a mistake.