We have reinterpret_cast, const_cast, dynamic_cast, static_cast.
What does the CPU do? Nothing. It doesn't care
It does care. If you have a pointer to a base class subobject and cast that to a derived type, i.e. cast<Derived*>(&my_base_object):
- reinterpret_cast might downcast "too far" because it casts to the most derived object for polymorphic classes, or do something else nonsensical if you're not dealing with polymorphic classes
- static_cast will downcast properly, but is unchecked and results in UB if you don't actually have a surrounding derived object
- dynamic_cast will perform a runtime check for whether the cast is valid and give you a null pointer if it's not
- std::bit_cast will reinterpret the pointer bits unchanged, whatever that does
And a C cast will ignore access control to allow casting to private bases.
My feedback on the proposal is simple: No.
If you want to use C casts everywhere in your own code, you can already do that. Don't expect everybody else to join in.