That doesn't make much sense imho. PoE gets away with this not only because of new mechanics and content added every single time, but because they add new supports/new skills opening up for new builds. Also, affixes on uniques and sets are fixed - only thing that changes is the amount but what enables builds are the affixes themselves and not the magnitude.

In D3 this is the equivalent of adding more runes to skills and more legendaries that affect more skills and different runes specifically. This makes room for new builds.