This.Sikhs have been allowed beards and turbans in U.S. military service since long before the uniform standards that are now being updated.
Since the '30s. There have always been exceptions to policy, as long as they're not prejudicial to good order and discipline.
And "uniforms" aren't all that uniform. Units have always had distinguishing uniform items; hasn't affected discipline or efficiency, from what I can tell. Beards have only been verboten since the '80s. and the pro-mask "excuse" is just that; no .00001% chance of using a pro-mask seems like it ought to dictate grooming policy across the entire force.
Not that I like facial hair, myself. But we're not going to lose a war because Joe has a goatee or wears a turban, any more than Joe wearing a maroon beret while his brother at Ft Drum wears a soft cap. BFD. Heck, look at the Brits, who manage to fight pretty well in spite of the fact they've got like 39 million different "uniforms."