I think a lot of it had to do with the mouth movements. Everyone's lip-syncing after the transition from WoL/Alisaie/Alphinaud felt kind of weird, like they mo-capped mouth and slapped it on CGI animation. Which, don't get me wrong, I completely understand the crunch the animators were under and the trailer itself is still gorgeous and hype-worthy, but the mouth movements felt so odd and disconcerting to me. Especially after the Shadowbringers full cinematic trailer was SO well done in that regard. Maybe because there was so much more talking in the Endwalker trailer compared to Shadowbringers that they couldn't give it the same love? Idk. But that's what I felt most weird about rather than G'raha's look in particular.