Outside of GPS satellites dont carry much data . partially because they cannot handle much nor high speeds , but partly beause theyare easy to intercept or interfer with. Fibre optic cables deal with high speed and securty but although they are not as easy to find as is often suggested cutign them close to major global nodes would be very serious. So toa degree both are needed. But then again the likes of Starlink and other similar systems need cable links between key ground stations for resilience and back up. So relying too heavilty on remorete control of actions isnt quite as good an iidea as it seems since there are always vulnerabilities in networks coverign any distance. So, piloted aircraft, crewed ships and platoons of squaddies cannot be made reduntant or replaced over night . Once they got the go -or run message leave it up to them as they can't be jammed