Don't drones have another advantage not mentioned here -- counter-battery against operators being more challenging?
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FPVs are man portable guided munitions, not artillery. Pretty much all existing man portable guided anti tank weapons are better than FPVs at their job.
And artillery is better than any of them at it's job. While FPVs can score kills they have minimal suppression effects, when an FPV hits a friendly, everyone else is going to keep moving, because stopping will offer them no benefit from the next one, and the next one might be minutes out. When an artillery round lands everyone hits the deck.
Also these are immature tech... I suspect at least some of the issues identified will be mitigated in time.