The point is Imprinting to 100% is unhealthy and not fun. The main counter argument is that it's optional and suggest not to do it. While probably a good suggestion, it ironically just supports the OP's point.
The imprinting system could be a lot better if WC changed it so anyone in the tribe could imprint. The first person to claim still gets the rider bonus. Promotes teamwork, easy to implement, and solves the sleep issue.