What power creep?
This game is not in crisis of power creep at all.
Fishing for greater rifts that are doable takes an enormous amount of time, it takes an enormous burning of keys, takes time to gather the keys, takes a good chunk of time to farm paragons ( and the game is all about paragons more than gear since the more paragons you have , the more you can do with any set or items), the need for teaming to farm paragons at a fast pace…
The work involved to break into the world top 500 is VAST, even to to be at the top 1,000 is no joke at all.
The amount of materials needed to be burned for reforging and so on…
The game is not even close to be in danger of power creep
On another note, making characters more powerful is always fun
THe amount of low satisfaction with having weak character far far far outnumbers the amount of low satisfaction for having strong characters.
The road for balance when characters or sets are not performing well is to improve those things - that is generally better and more fun; not nerfing the others