C.E. Evans wrote:
The only established precedent about Starfleet uniforms is that they frequently change. In light of any onscreen explanation for why they change, all we can go on is speculation and change just for the sake of change is as valid an idea as any other.
No, it's really not as valid as any other. Large organizations with vast assets and many thousands of personnel do not make large institutional changes just for the sake of change, that's just not realistic.