This tracks with the earlier ~12% drone kill efficiency estimates. However drone is a mass deployment weapon. Ukraine did about 2 million frontline sorties in 2024 and aims for 5 million this year. This 1 out of 9 ratio translates into absolutely devastating damage, that artillery and airstrikes (which are also hardly "easy to use") can only dream of.
This is true, but the author also talks about cost e.g. $500 for a drone vs $100 for an artillery shell with far more effect. Surely at the point where the drone has visual on the target you can fire 5 x shells over for massively greater effect on target, and keep the drone flying for the next target, and the next.
A 155mm (dumb, unguided) shell would set you back 5-8K USD. That's before the propellant charge, fuse and amortization of the artillery piece and its 5 man crew.