Hmm I can't actually properly have an opinion on his new film cos I haven't seen it, and I didn't even finish the trailer lol. I thought hereditary was ok. Not sure I agree with making horror fresh, it's a new formula of 'post-horror: or 'elevated horror' or whatever you want to call it, where everything seems to always be a metaphor for trauma. 'The real monster is trauma', is rammed down your throat over and over in this new wave imo.
Discussion
I do agree with you there, I've seen various different iterations of "Trauma is the monster", and a lot of them are awful.
This one is good.
Another film that I liked that broke the horror mould was that korean film "Parasite".