One, because military procurement is a slow, slow thing.
If you’re referring specifically to the Ukraine-Russia War, it’s also because most of the tanks in use now were largely built during the Cold War, with less effective armor.
Also, Russia is not using its tanks remotely effectively. NATO emphasizes combined arms, electronic warfare, reconnaissance, and air superiority, Russia tends to just throw unsupported formations at a particular objective. It’s a lot harder to get a FPV drone with a range of a few kilometers when you can count on your opponent either identifying where you’re launching from and/or bombing it and/or jamming the radio frequencies used to control the drone.
None of which is to say that drones aren’t or can’t be an effective weapon, just that it’s not as cut and dried as one might think.
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