Ahlul Bayt (as) gave no new fiqh. They gave Islam.
Insaan ko bedar tou ho lenay dou Har qaom pukaray gi humaray hein Hussain (as)
Ahlul Bayt (as) are the perfect template to be followed for guidance. There has never been a group of people on earth that has ever dealt with the society, under the most difficult of the circumstances, and still brought equity and justice to the humanity. They belong to the whole humanity including Hindus, Christian, Jews.
^In terms of equality and justice Imam Ali ra did not bring anything different than what existed at time of Umer ra. Let me know if there was anything.