This. Russia relies heavily on trains for logistics, so all their main depots will be near a railhead. Then they have to truck the supplies to the front. They'r

This. Russia relies heavily on trains for logistics, so all their main depots will be near a railhead. Then they have to truck the supplies to the front. They're lacking in trucks so the further back they move the depots, the longer the supply route. Putting more wear and tear on the trucks, slowing the supply amounts, etc. And trying to disperse the depots into smaller amounts doesn't really help; say you cut it in half somehow (ignoring the doctrinal challenges). Then you actually need more trucks, and you need to plan carefully about the supply levels at each mini-depot. Besides, if you cut the depot size, the Ukrainians will still hit them with HIMARS etc. One or two rockets is enough for most of these sites.