7.0 clarified one huge misconception that people have about the Fatui
Often times people fram the mission of the Fatui as someone wanting to burn the house down while everyone is locked inside. It's usually framed as "Okay remove all the safeties and you're left with the Abyss, what now genius?"
But the new Archon Quest clarified that they're going to *re-write* the rules. Why? Spoilers for 7.0 >!we learn that the blessings and rules of the Gods, even the thing about Gods loving humans, are all curses in disguise. Everything, even the good stuff is meant to be a double-edged sword to fuck you over if Phanes isn't happy with you.!<
The idea that the Fatui are just sending a bulldozer to Teyvat when everyone and their mother knows the Abyss exists (and it's explicitly stated that the Tsaritsa is against the HP *and* the Abyss) is a fiction usually cast by detractors of the Fatui. Because it's much easier to wave them off and not take them seriously by acting like their plan is the equivalent of removing all the heating, doors and windows when there's a blizzard.
Also in the livestream for Snezhnaya the Devs said that the other Archons think that the new way that the Tsaritsa is looking for is better than the existing system. The end goal here is obviously not a defenceless and weaker Teyvat where the Abyss is free to destroy everyone.