I'm sure this has been posted a lot but I didn't see any recent threads when searching. While they are a cool way to traverse the snow in winter, it makes it so that they are absolutely essential because if you're caught outside in winter without one you are basically just knocked out or dead. Anything that results in an insane speed advantage over other players is something that needs a counter rather than just also using it. A good fix for this (aside from completely removing them) is freezing them with hearth magic like raw hide. Ideally this and raw hide would be even cheaper than the current costs though in my opinion.
It's also quite dumb that you can endlessly sprint in the snow. It doesn't really make any logical sense that you'd be able to perfectly sprint in snow and in haven a permanent 4th speed landscape is terrible as you burn through a million liters of water.
TLDR: Remove skiis/sleds or add hearth magic to freeze them similarly to raw hide. Make it so snow terrain is 3rd speed and drains stamina similarly to forest terrain.