I hate the idea of Echo Buff. It should be part of some easy server not whole game.

[Galactimus]

OP's point is completely moot.

You can STILL complete all of the content in its original difficulty after patch 2.2. Your EX Primals are not being nerfed in difficulty unless YOU want them to be nerfed. Your first attempt is always at its original difficulty; and the instance is repeatable. You can play it at 0% Echo buff as many times as you want.