In part because anti-tank drone tacrics are a new concept and are still being tested and developed in real time. A few years is not enough time for one side losing tanks to field something to replace the specific uses and effectiveness of all those vehicles, nor would those vehicles do any better by sitting in storage than they would doing something, anything at all in the field.
You also don’t just throw up your hands and scrap everything when the enemy comes up with an effective countermeasure. You start to come up with countermeasures to that countermeasure, which, again, take time to test and experiment with to see what works best. Eventually you might realize that there are no proper countermeasures, and only then should you really scrap what you’ve got and move on.
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