Endwalker is the most controversial expansion

[DPZ2]

I expected the entire world would be infested with blasphemies but it was quite chill…

You know, things like blasphemies appearing in the old zones where the towers have been placed.

Blasphemies did appear in the old zones. We visit a few of them through the Role Quests, a sampler of what is occurring throughout the known world. I suppose they could have done something similar to WoW's zombie invasion pre-Litch King, but that went over like a lead balloon for me, full of unintended consequences (like "no fighting in neutral zones = nothing but zombies running around that you can't fight") and player zombies complaining when people actually killed them because they were, well, zombies.

Something like that wouldn't have gone well when Your Warrior of Light turned into a blasphemy.