The reason you should get the new Dharma expansion is not because of these policies or the minor tweaks it introduces to Europa Universalis IV. Rather, because it transforms the subcontinent of India into a much more interesting region. With the specific caste systems and the trading overhaul, the area is much more alive for those who play as natives or those who play as foreign trade empires.
Regalia: Of Men and Monarchs isn't a stand-out game in any means. The combat is challenging but achievable and there won't be any fights that you will tell your grandkids about. The plot is humorous and the characters are enjoyable, but neither the narrative nor the characters will set the world alight. What Regalia: Of Men and Monarchs is though, is a JRPG that stands on its own two feet, and despite taking many influences and using certain generic conventions, it manages to carve its own identity.