I don’t think that ruins it for me, rather the opposite. Ashitaka is a member of a tribe far away from the places in the movie. When he gets there he is just an observer to the war between industry and nature and wants to form his own opinion. He gets sucked into it and even if he did nothing the story would have continued almost the same, bar the ending where he then has made up his mind. I’d have to watch it again and spare more than a few minutes before sleepy time to write a better response, but those are my two cents
For me it was Monster Hunter World. I’d be lying in bed and on my head I was just going through the motions of fighting a monster, complete with the button combinations and all.
Bonus: when I started learning programming I was at an after Party at a friend’s place after a night out and was on a few things and when I closed my eyes I would see lines of code and functions etc.
I then went to the toilet after partaking in some ketamin, and I tried to solve/debug the function in my head to release urine from my bladder. Fun times!