What we're watching today is a master class in lithe, adaptable forces smacking the snot out of a bigger, more kitted out, more linear force. The revolution in drones is so impressive that I wonder if we can ever have a functional Armor branch in the Army again, given their high lethality and low cost.

Absolutely. This.

Ukraine has basically removed as a threat one of the two strongest potential foes (Russia, the other being China). It will take a decade or more for Russia to recover.

I get the feeling you would really enjoy the YouTuber "Perun". He really gets into the nitty-gritty, and covers defense economics that most other outlets don't cover. It's a bit geeky, but if you're into this stuff, it's extremely informative and insightful.

Regarding armor, I think it will continue to be useful during fast-moving operations. "Blitzkrieg". Highly mobile artillery supporting infantry. But once that initial shock is over, they are expensive sitting ducks. I suspect we soon will see tanks having their own drones, probably for anti-drone activities, and to make the battlefield more transparent to them.