I suspect the point is taking advantage of a number fleet of artillery and tanks and soldiers who don’t need as much support from those, and avoiding the Russian mistake of creating easy targets. It’s almost like a macro version of what the US legendarily did in micro in the Revolutionary war when in battles we ran and fought from all angles instead of presenting an amassed phalanx. (And yes, I’m aware that the American Revolution tactics are largely legendized.)
More to the appropriate cultural reference, the Ukrainians have been making great use of “light cavalry” (Cossacks, anyone? Cossacks were originally Ukrainian) on ATV’s, Hummvees, and all sorts of light vehicles, to penetrate between Russian strongpoints and cut roads, harrass rear areas, take critical positions, lay mines, ambush convoys, etc. Often they have been sufficient to spook the defenders of some town into retreat, for fear of being cut off.
As long as the Russians dont have the manpower to form contiguous lines they are vulnerable to such tactics.