Associated kept a platform longer than other manufacturer. Yokomo, Tamiya, and xray revamp car models frequently. The ability to rapid prototype parts means you will see specific platforms being updated more frequently. The days of a car lasting 6 years are long gone. The manufacturers would love to have a car last four years or more as they'll get a greater return on molds and testing costs. But to stay competitive, ae chose to build a new car. Good for them and it shows they still care about giving the consumer the best car possible. accept it and move on with your life.