Drone warfare is brutal. Tiny, fast moving, highly maneuverable, lethal weapons.

Once a drone has found you; you have very little chance of taking it out before it's within blast range, and even if you do, a remote operator that you can't reach now knows where you are and can simply depoly another drone. At best, you delay your death; more likely, you're hit before you've even seen the direction of contact.

It's so asymmetrical, regular infantry has no chance.