Originally Posted by Blizzard Entertainment
The intent of our change in 7.2 was to smooth out that progression curve a bit, not flatten it out, and certainly never to invert it. If you get a great set of item upgrades that make you 5% stronger, maybe the world gets 1-2% tougher. Perhaps instead of getting 400% stronger over the course of the expansion relative to the outdoor world, you only get 250% stronger. But you should always be getting more powerful in relative terms, and upgrades should always matter.