The point of echo is to give you a little push to beating the fight without being held back by other reasons besides the mechanics of the fight, Bad dps and being under geared might prove to be barriers for clearing hard encounters, which is why there is echo to make that part smoother. It's not there to help you ignore the boss mechanics the developers spent so much time creating for the enjoyment of their players. :I

By the way, all the HM primals can give upwards 50% echo, and all the EX primals, minus shiva, are mostly done for both their loot and challenge. So again, do we really need Echo to be better?