Wasn't Ukraine blocking drones with nets?
Warfare is evolving. If you have anti-defense for 20, they'll send 30. If 30, they'll send 40. Sometimes you need something as a "safety net" just in case. It is better to have it than not. Russia militarily is a joke in many ways. Disliking them doesn't mean everything they do is stupid.
Most of the threats now need to be adapted for by even leading military powers. What defends now won't in 2 years. Adaptability is the main advantage now.