Why would this even bother you?
No one's forcing you to wipe on hours on new content, you could just wait for the inevitable nerfs before you go do the content if you want, so saying that you worked harder for the same gear is not a valid argument at all.
Why do any of the content at all? Because it's a game, and it's fun to play said game. Some people like to play more challenging games than others. It's not rocket science.