For one I'm pleased we're not that far behind the curve. We made a mistake going for the F-35 I think as well as some other recent large scale procurements, but hopefully we've learned from that now. We need smaller, cheaper systems that can be readily distributed, rather than a few expensive missile and drone targets.
[1]: https://www.regjeringen.no/en/whats-new/norway-and-ukraine-t...
What happens in Ukraine is a low-tech war between opponents who both don't have a viable air force and exhausted their "normal" weapons like tanks and artillery, and are thus forced to improvise. This is guerrilla warfare level, probably even on a worse level for Russians than for Ukrainians.
Only lesson to take from here: build electric interceptors for Shahed-like drones and stock them, probably add a range channel into them by using a simple 1-dimension doppler radar thus enabling head-on intercepts. Because the enemy that can't operate against US in the air (that is, every potential enemy on Earth), will try to use them or similar as the 'next best' alternative to a JDAM or a laser-guided bomb delivered by aircraft. The rest (so far) isn't important.