Many loggers are reluctant to sell plain logs as fuel but it is THE tier one fuel. Adding firewood would clean up shops significantly by removing every log and just adding firewood. Firewood would be a slight improvement over logs but differentiates it from their raw resource which most people don’t like to part with. Firewood would be made obsolete by charcoal. Could differentiate between “wet wood” and “dried firewood” by having a drying rack that must be stored outside, some areas dry faster than others, so you’d split then dry logs.