(Serious Question) What’s stopping the Air Force from just allowing male Airmen to have facial hair?

I’m clearly new ofc. But it seems like such a hot topic with no downsides for allowing it. I’ve never heard of anyone really opposed to it. Other countries allow it so why not us?

I can understand that it’s a tradition. But wouldn’t it be one less thing to fund? Instead of having everyone in need of a razor or needing a shaving waiver. Make it fair across the board and set a professional standard. It also can’t be healthy going this route.