> As we can see, most Russian armor movement happens on roads

That's why they're being annihilated. Moving your forces on roads is something you do after you've secured an area, not before.

Then you haven't spent enough time on /r/ukrainewarvideoreport. There's tons of videos of tanks, artillery and anti-air stuck in the mud, abandoned. It pretty much forces the Russians to stick to the roads, which makes them very vulnerable (they're all lined up and can't escape anywhere because they would get stuck).