In some sense, drones can replace the earlier usage of satellites, especially for countries which do not have a surveilalnce satellite fleet - satellites grant

In some sense, drones can replace the earlier usage of satellites, especially for countries which do not have a surveilalnce satellite fleet - satellites grant visibility of the battlefield without needing air superiority and risking your pilots; drones do the same. An in a major conflict, it's likely that the big players can take out each others' satellites (and those can't be replaced quickly/easily) but drone swarms can still provide battlefield visibility even in that case.