Also, some Israel and US tanks already have active protection system (APS) that can automatically shoot down anti-tank guided missiles (ATGMs), rocket-propelled grenades (RPGs), anti-tank rockets, and high-explosive anti-tank (HEAT) rounds [0].

Don't think it'll take too much to update them to also shoot down drones.

[0]: https://en.wikipedia.org/wiki/Trophy_(countermeasure)

I saw video (coupla years ago) of a Russian tracked vehicle using radar and a gatling gun to shoot down a swarm of about 20 drones in about 2 seconds. But (a) it was a staged demo; (b) I imagine that drone-swarm technology should be able to defeat that, by having the drones jump around unpredicatably (they're very agile); and (c) tracking radars can only track a finite number of targets. Send up enough drones at once, and one of them will be able to kill the tracking radar.

Precision. Depth of magazine. Engaging multiple targets faster.