If I were to add a new branch, it wouldn't be a Space Force.
It'd be a cyberwar force.
It'd be a cyberwar force.
[1] https://en.wikipedia.org/wiki/United_States_Cyber_Command
It's like asking why not get rid of military in favor of militia, Hired guns, And police forces?
Who had what authority. Funding. Jurisdiction and related. And plenty of other things.