GST is not injurious for federal system as it includes both CGST & SGST moreover petroleum products are excluded from GST which can fetch ample revenue for the states.
North East was under developed not because of lack of potential but because of lack of political will power. Modi government has converted Northeast into connectivity hub.
Nobody can try to make Hindutva a political tool since they can neither appease it nor gamble with Hindus’ feelings,if they think so it's nothing but Castles in the Air.