The problem is money. Given that the states through the various national guard acts have passed much of the responsibility of having a state force over to the federal government, who pays for training, arming, etc.? The states can no longer afford to do it (or so they say!). State militias are much much more now than asking people to get their rifle down from over the fireplace. Many states (Not all!) retain a state guard which is under state control but it’s a mere shadow (In some states less than that!) in responsibility to what a state militia once was.
Personally, at this stage in history I think Space Force as a separate uniform service is a stupid idea. It should stay as a USAF command. I think the senators that sponsored the bill setting up the service see it as a money pot to fund things in their home states. I think it was Manchin who put a section in the bill to stand up USSF national guard units. You know he sees it as a means to create government jobs and funding in WV. When we have space planes & space battle craft then OK, stand it up! We’re not there yet! It’s a boondoggle excuse to spend defense money!
Excellent point. If the federal government is funding it, the federal government will exercise control over it.