Was Phanes the one who rewinded the activation of Huitzilopochtli?
Well, you remember it. That Dragon-made Phlogiston-ifying Doomsday device that served as gruesome fail-safe method of guarding Teyvat against the Abyss.
Recently, I read about some people stating that Phanes, despite being in coma/sleep/whatever energy saving mode it can manage, still awakens briefly - if something truly world-ending happens.
In their statements, they claimed that Shades only acted somewhat locally: Istarot preserved Zi Bai and gave some powers to Venti, Ronova did the whole Khaenrian punishment thingy and helped Natlan, etc. But nothing among it was, like, really global really fast. Activated Huitzilopochtli, on the other hand, certainly was.
So what if it was Phanes that rewinded the time to "softly" force a survivable option in this quest? Fontaine stuff, Gnoses stolen and even Dottore's experimental rampage were, let's be real, at best local inconveniences. Nothing was globally devastated beyond repair, and locals sort of managed to fix all that at home, to the best of their abilities.
But no amount of local fixing can prevent "LET'S TURN WHOLE PLANET INTO SHINY MAGICAL LAVA!"-machine from doing...well, exactly what I wrote. This shit is unforgivingly permanent in it's work and scaringly fast in it's completion. World might need Reason to kinda awaken, even if unseen, and un-make such terrifying choice, otherwise there's no saving anything.
I can't support this claim by anything valid, as my knowledge is lacking, so I won't be zealously defending it. Take it as, at best, uneducated guess.