Why would you need to land at full power in snow or soft ground in a tailwheel? I'm assuming you need to be careful in a nosewheel in order to avoid the nose digging in and flipping you over, but that just doesn't apply with tailwheel - the point is there isn't a nosewheel to dig in.
I've flown tailwheel off and back onto snow with no problem. Standard three pointer. In a classic tailwheel, such as a Cub, the touchdown speed is considerably less than the touchdown speed in say a C152. Same for nosewheel - standard flare keeping the nosewheel off until it comes down by itself, but this is no different to a normal landing. Won't fly retractable due to risk of bringing snow into gear bay and freezing them shut. But that's a different thread, probably.
Based on only a few trips experience with reasonable snow on a paved runway, so willing to hear explanations of where this might be wrong (not flames)