The biggest loss IMO of the Remaster

The NPC gallery from the legacy GMG wasn't reprinted in GMC. No more generic "bandit" "mad scientist", "assassin", "priest", "necromancer", "gang leader"

These had a lot of value for telling the sort of stories I like to tell in my games, which are less about killing unequivocally evil "monsters" and more about regular people who may be morally complex and provoke more interaction from the players.

I'm well aware one can simply use legacy content, but that ignores that some of these had mechanics that have been revised in the remaster, and they were an important part of the toolkit provided to GMs in the GMG. Right now, the GM Core feels very lacking in terms of providing support for creating a cast of NPCs in adventures. There's literally a half a page dedicated to NPCs and it basically just says "make 'em up". Saying "You can use legacy content" is not a valid point when these new books are supposed to serve as a foundation for the system standing on their own.

Additionally, the official Paizo FoundryVTT bestiary portraits module, which I paid good money for, appears to have removed the portraits for these generic NPCs when the remaster content was added to the system. The realization of that was actually the thing that prompted this post. I was setting up an encounter for my players and was confused as to why the "Antipaladin" art was this instead of this. I am almost certain that before the remaster it used the art from the GMG for those tokens.