The characters younamed weren't playable though. Only character that stay dead and as I pointed out still showed up on the Moon was Tellah. I suppose it could be said that the characters you named could be considered as backstory for the actual party as their reason for joining the cause though...

And I dunno, definitely not all FFs resurrected everyone. Like let's say Vivi in FF9, it is clear that he died sometime after the story, but they make it optimistic with Vivi's sons. Or Tidus and Auron from FFX both dissapeared and I am not counting in the FF version of Charlie's angels, where if you do absolutely everything Tidus cames back. Or Aeris in FFVII died permanently as well, her death was actually meaningful and if they bringed her back at the end, everyone would go "wtf". I am not too sure what happened in FF 2, 3, 5 and I never played 6 so can't say what happened here.

I suppose it's just me that would enjoy a little more darkness in the story.