> SREs should configure their infra by hand sometimes to not lose that skill

Actually... yeah, I'd totally say that. Some SREs in my company never wrote a single line of HCL that wasn't a call to a in-house, pre-approved module. They think they know Terraform - they don't, and they don't know what's under these modules either.

Terraform, as with any language, is mostly useless for humans now. It is for the agents full stop. You are correct though, we need to know the underlying architecture and most importantly why it is the way it is.