I'm sorry that we ended up discussing this because all you did was invent situations and argued with people who didn't even state any of what you managed to read.
No one is telling you not to deal with CORS your way. Fact of the matter is that you can avoid it, but you're making up reasons why you can't. The only reason you can't is because you won't. You're free to use whatever approach you like, there's no police here, just don't state that I or anyone else wrote what we didn't. It'd be grown up thing to do. Thanks and best of success with your projects.
I'm sorry but that's simply not an acceptable constraint.