I play PoE for few years now and when I go play Diablo or Last Epoch I don't wanna feel like playing another PoE. Obviously D4 is not aimed at hardcore PoE fans and never was. And thats a good thing. Not every arpg need to be done with 3rd party tools in mind to tell you how to optimize build.
Sometimes i just want something engaging but simplier than PoE. Not every game have to be the same.