Just a couple of comments.
The school is being reasonable in having a low x/wind limit for initial training.
If you cannot demonstrate profficiency in wheel landings in high x/winds you should not be allowed to do anything except taxi a Cub.
If you lose directional control during a take off or a landing you can wreck the airplane.
If you lose control and wreck your airplane during taxiing you are taxiing to fast.
Chuck