Russia doesn’t have a professional NCO corps, so the generals have to lead from the front if they want to get something done. I read that one general got shot when he drove to the front of that epic Kiev traffic jam, got out of the vehicle, and started waving his arms around to try to get people to untangle the mess.
The fact that the Russians don’t have secure comms doesn’t help with this; it makes generals easier to locate (for US intelligence, in particular) and also encourages them to meet people face-to-face (at the front) rather than send orders via unsecure channels.