Team orders might have something to do with that - so not really a fair comparison.
As for Max driving for Ferrari or Mercedes, its a moot point simply because he doesn't, nor does Gasly, Ocon, Perez, etc, etc for that matter.
However I am sure that you are right and that one day once he has grown some hair on his balls, he might become WC, assuming of course he can keep his seat in a car.