That is the war the west trained Ukraines Army to fight, but from what I am seeing this war has become something entirely different. An organized Light Infantry Army going up against a wholly mechanized Army...and winning. Ever since the US wars in the middle east, there has been debate in strategic circles as to just what is the most effective combat formation. Light Infantry or Armored. The US, having infinite money, went with the little girl solution. "Why not both?!" as such we have entire divisions of Light Infantry and entire divisions of Armored, with most forces being a weird hybrid capable of doing one or the other. This was aided by the fact that Light Infantry was ideal for counter insurgency. But the question remained as to whether or not they were effective against a peer power.
The logic as to WHY Light Infantry has suddenly become a subject of debate is due entirely to computer miniaturization. Computers have gotten small enough in the last 30 years that you don't need a massive truck or tank to hold the guidance system for a missile. You can fit the thing on the missile itself, and make the missile light enough to be carried by hand. Where before you need a 40 pound computer mounted to a truck in order to launch a guided missile at an attack helicopter, now you just need the equivalent of a 2 pound laptop. In essence, an infantry platoon dismounted is now capable of the same fire output as a mechanized unit 40 years ago.
There is the downside, in that dismounted infantry are not capable of advancing as far as vehicles, and can be exposed to enemy fire. At the same time though, light infantry is not restricted by fuel, or road access. In some cases, a Light Infantry Company can actually advance faster then an Armored Company as it is capable of straight line distance marching. Its also not restricted to roads in certain circumstances and is able to spread out. There is also the pure Machiavellian observation that a Light Infantry platoon is far cheaper to lose then a Tank platoon.
I think this war is ending the argument. The Tank as it exists now is functionally obsolete. Which is a huge problem for Russia, considering how tank heavy their Army is.