It's useful in saving the pilot's life. With less advanced tecnologies, more pilots would have been shoot down. It's useful in targeted attacks, but they have proved themself uneffective (at least for now) as the new leadership is alined with the objective of the replaced one. It's close to useless when it comes to making the war cost-effective, which start being a relevant metric when the conflict start lasting too long. Of course the US has a bigger economy, so all the news about cheaper systems damaging or destroying quite expensive ones may still lead to a US victory, but a costly one for sure