All these things have been abloshied by law. Even today the Muslims and Christians are sticking to their religious dogmas. Read the "Hindu Succession Act" and corresponding "Succession Acts" of other religins as a sample.
No sane hindu will tell you that we have to follow the outdated religious dogmas. Despite all short comings , Hinduism is dynamic enough to change with times.
Also hinduism is not a religion in its narrow sense. It is a coglomeration of various beliefs and even non-beliefs also. Atheists exised even in Vedic periods and were called Charvakas.
