I suspect standarization is key. If it's a built in battery at the factory, at least same charging interface. If it's a fuel, same fuel. I wonder if otto fuel (from torpedoes) would be useful, especially for single use drones?
Yeah if your per drone cost is $1000, but you have a good kill/useful intelligence ratio every time you consume a drone, maybe it's not even a driving consideration. So for example if you decide to deploy your drone swarm in area X, do you consider that to be the same as CAS where let's say you've burned $300k of fuel, maintenance and airframe (or the equivalent in humvee hours and associated back surgery/physio for the crew), so you just say whatever, all the drones are considered consumed?
It's really about the choosing which of those conflicting requirements are the most important. Do you care about reuse? For micro cruise missiles, I suspect not. It's basically a flying smart mine that can coordinate with all the other smart flying mines without phoning home. For Mr Robotank, I suspect reuse is much more important, as well as maintability and fitting into the supply/maintenance organization with wheels, ammunition, fuel, poorly applied reactive armor tiles etc.