To be looking at those videos as a mechanical engineer having anything on the ground with all the rubble, mud, dead people would be extremely difficult to move around. You actually see the solution to this problem in the video.
Deliver enough explosives from the top to break the bunker. An automatic grenade launcher to deliver a couple dozen grenades on top of the bunker would have cracked that one wide open. There are other means of delivering explosives. In another video they are throwing whole bags with explosives on a position and detonating them with wires.
The other alternative is to have a precision weapon. The attack would have looked very veery different with a dozen of hand grenade drones flying into the Russian bunker. I mean for this situation a flight time of 2 minutes would be enough already, but would give the opportunity to deliver drones precisely into holes or around corners. Hell even 5 mavics on rotation dropping a grenade every minute would have been enough to kill all Russians at this location.
For the price of one walking dog or snake you could produce hundreds of short range suicide drones. I mean even in world war II the Germans experimented with remote controlled vehicles. But so far no viable solution was found to deliver explosives on the ground in such an environment. And frankly I believe there never will. Just use the air. It is so so much easier to precisely deliver your cargo.
