technology

I don't think drone heavy vehicles make that much sense. They are very heavy machinery that requires a team of people that are capable of maintaining it, particularly after damage, and handling any kind of difficult terrain requires infantry support. There's a certain degree of improved situational awareness and judgement that comes from actually being in the vehicle rather than operating something on a monitor too.

Why make drone tanks anyway? The point of a tank is to be heavily armored for the occupants on board. If you don't have occupants to protect then you don't need the heavy armour, you can improve every other characteristic of the vehicle.

Cheaper, disposable, fast moving vehicles with some heavy armament make more sense as a drone platform. Armoured enough to deal with small arms fire and disposable enough to accept losses to anti-armour. Just make sure the factories can shit out a lot of them.