It’s an attempt from blizzard to make people experience more than one build and play the way they want to play and not simply follow mythic raider X and pvp gladiator Y for their builds.
Unfortunately, this plan of theirs won’t work. People will now be forced to copy things even more than before, because the system is too complicated for most to determine what they should use. And as another consequence, we lose the RPG aspect of the game for the sake of battle power. and a ton of other downsides.
But this has been blizzard’s viewpoint to all things.
They always underestimate the tenacity of players, overestimate themselves and are stubborn beyond imagine.