The thing that makes vehicles inconvenient in flat as a pool table Ukraine are huge losses incurred daily by drones. The only reason to see donkeys now is because they are cheaper than Chinese mopeds and two-wheeled tractors ru troops currently use for short supply trips, not to mention loafs/hunters they were paying ~$15K/piece in 2023. They make sense due to disposable status of ru soldiers, no need to worry about survivability, no hummer/mrap/apc for the meat.