namely your high cost weapons take out air defense capability, so you can stop using them and use cheaper more numerous systems to hit the now undefended targets.
That makes no sense to me. Why would I spend millions times, dunno how many do you need for a guaranteed kill for an S-400, if you could spend hundreds of thousands on cheaper ways to kill the same S-400, while the S-400 still defends itself with millions worth of its own missiles?That's precisely what Ukraine was/is doing and has developed. The West provided lots of military support, including the US of course, but way not enough as we can see now play out in even the US itself vs. Iran. They developed cheap drones that can shoot down cheaper Shaheds. Shaheds that are way too cheap to use regular interceptors for. But even cheaper drones tip the scales back.
Why would I want to waste Tomahawks 1:1 vs. S-400 interceptors, if I can kill it with a much cheaper drone swarm?
Not saying those precise conditions/weapons exist today. I have no idea. But if they did, why would I still waste my high cost weapons.