PvE is mine and many other's preferred game mode. And from that perspective it often seems that PvE is largely ignored when it comes to balance which I feel is a mistake. A lot of classes under preform and the dominant builds tend to stay dominant for years. This creates a rather stale format. Although some like the consistency of it never or rarely changing, I don't hold that position at all.
Tackling new content with the same exact build I've been using for 4 years leads to long periods of fatigue with the game and short bursts of interest.
You could tell me to do PvP or WvW more. But those formats are extremely stressful for me. I don't like killing other players, I get no enjoyment from being killed by them myself. I prefer spectating those. And my involvement with spectating is directly linked to my enjoyment of PvE.
So this post is more personal feels on the issue. From my perspective, PvE is the most important part of the game. And new content is soured for me when the gameplay has stagnated for me. I enjoy a PvE experience that is evolving. And without new skills being added, balance is where I turn to to find my thrills with experimentation and adapting.