Thank you for pointing that out.
You aren't really debating my points. How is FF XIII's story simple on a surface level? Since when has FFX's cast been criticized as being underdeveloped en masse by fans and critics? Story through gameplay? That has never been Final Fantasy's thing. My second paragraph applies to FFXIII? No it doesn't. The first 15 hours of FF XIII jumps between party members, usually doing completely different things in relation to each other. The main cast of FFX are together the majority of the time. The sphere grid is similar to the skill system from FF XIII, I'll give you that much.
You aren't "slaying" a crow of any nature. I'm almost convinced you haven't played FFX based on the things you said. The "they're both linear" argument also doesn't hold up. The pacing in FFX takes off once you reach Kilika Island/Luca, which is about 3 hours into the game. FF XIII's pacing is fucked, it feels like long stretches of nothing happens. You go through wasteland after wasteland after wasteland, the world in FF XIII feels empty, which in turn messes with how things are paced.
Linear isn't a smear word, some if not the majority of the best games in this medium are linear. World maps and wandering in fields isn't something that's needed in a Final Fantasy game to be considered great. The story, characters, and pacing felt incredibly off for most people that played FF XIII. The same cannot be said about FFX, critics adored it, a lot of fans loved and still love FFX. This isn't the case of "well they're both similar but one is newer and didn't change much", FF XIII was the case of bloated development and really questionable writing.