Except movies are also an industry, one that employs millions, and industries (especially of that scale) that conduct themselves in this fashion cause an incredible amount of societal harm, whether physically, socially, or economically.
I stated my case plainly. You're the one literally engaging in doublespeak, since you're intentionally using "discriminating" in multiple ways here.
Your hypotheticals are meaningless. There is no actor who is so "significantly better" at being the ethnicity you are casting for than an actor who actually is the ethnicity you are casting for. You literally cannot "incarnate the role" better than having been born doing so.