Fundamentally it’s not about building anti-missile technology, it’s about doing it cheaply and at scale. That is a much, much tougher problem.
These drones cost less than a thousand bucks, and if each interception cost you 100k (the cost of a trophy shot) you’re going to lose a lot of equipment. It only takes one miss.
Now imagine scaling that system to protect an entire airfield. That seems next to impossible when these drones have a range of 10+ miles and are basically unjammable. You need China level surveillance across your entire county as a bare minimum.