Except testing has already shown the the 625 is not an effective counter to drones due to range and number of systems and ammo needed to provide adequate protection.
The current best hard kill counters against FPVs are lasers and microwaves.
I can also see automatic shotguns with drum or belt mags being added as an additional addition to the tradition HMG on RWS as more of a last ditch defence. But that’s more for psychological support for moral rather than being truly effective.
For counter drones, I think it will be a similar situation to counter air, where offence is the best defence. You try to shoot down enemy tac air before they spam munitions at you, rather than just wanting to shoot down every bomb and missile coming at you from close range.
For counter drones, I think the preferred approach would be to have your own drone swarm pushing ahead and around your main advance and engaging enemy drones and pilots as they expose themselves to launch.
Terminal defence is basically the same as CIWS for warships. You need to have them, but you really really don’t want to have to actually use them.
