why do we need Phd and MD "inside" the government ? Instead the government can just ask normal PHd and MD working for the private sector or for university for

why do we need Phd and MD "inside" the government ? Instead the government can just ask normal PHd and MD working for the private sector or for university for their opinion. I 100% understand why people dont trust an MD which is affiliated with a specific Political Party. If you want expert to be neutral (no political) they can't be part of the government.