Sometimes I heard people saying that it's not UE5's fault if the games are not optimized, and the devs are at fault for not knowing how to use the tools.

But I never believed this. Why there isn't a single technically good game done with UE5 I can think of?

This video gave me some answers:
https://www.youtube.com/watch?v=Ls4QS3F8rJU

Informative. Anyway, just another reason that adds up to the countless reasons of why Epic Games has ruined the gaming industry the most, even more than EA.