Can you tell me where I said D2 is complex ? Its so easy to compare a 2000 game with a 2013 game inspired on that one.
But for sure, when D2 launched, the game complexity for its time was much more intense than PoE on 2013.
I played PoE for years as I played D2 and can assure that go into some online tool and create a viable PoE build after look into how many tutorials I want on Youtube/Reddit or watching streamers only takes time, but definitely is not complex.