They didnt make old content more simple they added a new level of bosses that require 3 times more materials and more challenging fights for the average player, pets were in D3 they were going to be added just like wings at some point, all the best features of D3 will eventually come to D4, noone here is going to accept your nonsense.
Your main argument was having boss materials be all one type was it not, that is never going to happen, the other materials will also have their own specific drop areas so you will always have to do certain content to get those rewards, moaning about the game so much you should just not play it again.