And the point of changing expertise to as huge as it is now is to make expertise (And therefore pvp gear) absolutely better than any other stat for pve.
But bolster, as you said, was to make pvp gear not vastly superior. Even though 60% is vastly superior.
The two philosophies contradict each other, which is part of the problem with bolster imo
Well back when Expertise was relatively weak, it was confusing people into thinking that their PvE gear is better than PvP gear and you still have the same problem. I think they made Expertise so big so that they've a bigger range of values to work with. Obviously UW gear would have no shot at being competitive against Conqueror if there isn't Bolster. You sure won't going to do 60% more DPS for wearing UW compared to Conqueror, and people would complain (rightfully) that their best PvE gear doesn't even stand a chance in PvP.