Being able to inherit from Ingress and add a parameter of say public=True/False and then it change annotations, middleware, etc and then being able to re-use that across 100s of stacks is very powerful. DRY is not something HCL is good at.

That's very subjective. Concepts like iterations are inevitable, and they don't look great in a declarative language like HCL.

I also find refactorings considerably harder in a declarative language, since configurations have a rigid structure.