Problem is that munitions carried by drones are much weaker than artillery shells - more like grenades. On this page is a turtle tank that took 60 drone attacks to disable. https://simplicius76.substack.com/p/western-analysts-find-li...

Russians are able to retrieve 80% of disabled armored vehicles to repair them.

A tank does not even notice cluster bombs - this type of bomb is effective against infantry and civilians.