it feels like a handful of people didn’t like Jafar’s wish of wanting Sinbad to return - and like, I get it, but I’m also biased and feel like it comes from a place of people just not liking Sinja lmao.

Which I know isn’t entirely true, and I get it - Ja’far deserves to be his own person, but he.. he is? He was written with way more character and personality and story than Morgiana in some cases! He IS his own very unique, individual character… who just happens to find Sinbad important!

He’s going to visit Rurumu, he’s going to visit his friends. I know people want more confirmation from “word of god” that he’ll do these things, but I dunno. So much Ja’far critique I feel comes from just “ew why does it have to be about sinbad again :/” because Sinbad is his best friend ??? And I’m sure Ja’far has a HELL of a lot of regrets and shit to talk to with Sinbad, whereas he’s made peace with, say, Rurumu for years now, and has been keeping touch already with friends as we know he names Masrur’s child.

Like - Judar’s is just some comedic, no development “CONQUER ANOTHER DIMENSION!”, Morgiana’s is rather vague and wouldn’t you think she’d want to travel the world as well? or look forward to her marriage or something? Something about her life with Alibaba/Aladdin? The fanalis thing is vague when we never even got her Big Fanalis Adventure in the manga.

My point being that all the wishes are rather simple, casual things and it’s not their ONE AND FINAL ONLY WISH. Like, Hakuei was in a coma for so long and wants to JUST help Kouen? Not catch up with her brother or anything? It’s just one of the things she wants to do!

I know it’s disappointing because these feel like the last scraps of character we’ll get now that Magi is over, but like.. I don’t know. I’m probably just the big idiot bully who likes Sinja but it just really does feel like Ja’far can’t care about Sinbad because suddenly it becomes about him being too “obsessed.”

Both people who dislike and like sinja can express their opinions, so don’t feel bad or like a bully. 
I don’t like the concept that because we are a majority we have to shut up. It makes no sense. We all in the fandom deserve to have opinions as long as we are respectful about it and don’t insult real people in the process.

Tbh I also feel the few people who didn’t like Ja’far’s wish don’t like sinja lmao. Like you said, for example, people who like en~ ei or don’t mind it, haven’t suddenly commented about how they don’t like Hakuei wishing to only take care of Kouen, so yep, in the end it’s all about likes and dislikes (and there’s nothing wrong about it).

I did not only find Ja’far’s wish lacking, but everyone else’s too. But just like you, since I ship sinja, I was happy about Ja’far’s wish.
I’m kinda bitter because Sinbad literally lied to him and left him, but Ja’far still loves him. But at the same time Ohtaka had no time to show Ja’far’s reaction to Sin’s doings (his or anybody’s). So we will never know how Ja’far really feels about what Sin did. But taking on account how Ja’far is, his personality, it’s really obvious that he’s not just gonna welcome Sin with a hug. 

Tbh what else could he wish for? He’s back in Sindria, he’s back to his old position (which he loves, which was his dreams since forever), his family the other generals are ok. He can visit his fallen friends’ grave when he wants. Ja’far has returned to the country of his dreams and all his friends are ok. So what is he lacking for his life to be perfect? Sinbad. So, that’s what he wishes for.

Rather than Sin being the focus of his life, he’s the last piece he needs for everything to be perfect atm. Not to mention, he’s pretty much his life partner.

But well some people don’t like that, so what can you do. 

Just like you, the only thing I disagree with is people saying his character is underdeveloped or only focused on Sin. His love for Sin is great yes, but he has several other interesting things going on. Starting with his obssession with work and the fact he’s continuing his life after Sin with optimism. Not because his wish is for him to come back all his other interesting traits are erased.