Just wanna say, in JRPG's "Supposedly benevolent god is actually super evil" isn't really a fresh or unique direction, its actually incredibly common.

And I think people taking "sides" between the two based on the idea that one has to be malevolent is sorta missing the point. They were both created to save the planet. The definition about what "saving" it meant was just different between there summoners.

I think the actual direction there story is heading isn't "This one is the baddie go kill it" its, that the fact that two being both born of good intentions ended up being diametrically opposed not out of any choice of there own but out of the specific ways in which they were created.

It's a tragedy, not a conspiracy where one is gonna end up the Big Bad.

If anything I imagine Endwalker ends with both of them sacrificing themselves for the star to help end the "Sound" because despite all there differences they still have the same fundamental goal.

Basically two imperfect but not evil gods is wayyyy more compelling to me then just flipping a switch and saying "Haha good god bad......again."