If all you want is SATCOM, GPS, and some overhead intelligence collection, our current force organization and the NRO do all of that very well already.
The reason that you now need an actual Space Force is to do combat in space. And that is coming. First of all, China and Russia are avidly developing counterspace weapons. Secondly, they are trying to replicate our own fantastic space-enabled warfighting techniques. If "sh*t gets real" with a real dangerous "near-peer," they could start taking out our space assets.
“Space Force is to do combat in space. And that is coming.”
Coming? It’s been real for decades.