As the cost of drones goes to zero, the expected damage you take is roughly proportional to how much you have to lose. This means larger / richer economies cannot win these sorts of wars. To see what I mean, check out this desalination plant map:
https://www.theguardian.com/world/2026/mar/23/iran-threat-to...
It doesn't help if your commander in chief is incompetent and your invasion strategy involves treating desalination plants as legitimate military targets.
Of course, blowing up desalination plants in the middle east don't hurt the US all that much, but blowing up industrial supply chains does. We're something like 4 days away from a global chip manufacturing industry shut down (barring some logistic miracle, since we recently sold off our strategic helium reserves).