Feedback to World of Warcraft: "Can you please make a version of the game where it's just me, and remove all the other players? I like computer RPGs and I'm annoyed when other people are killing the mobs I need to kill for my quests. I think a lot of players also like solo computer RPGs, so you'd broaden your audience if you had an option that had no other players there."
I don't like responses to "allow people who only want to PvE to do that" to be "Go play another game, you baby", but the point that I'm trying to make is that the danger of being attacked and killed is core to not only the game design, but the vision for the world they're trying to create. Without danger from player conflict, the world doesn't work and you are playing a different game. The game is based around player interaction (both positive and negative), if you are allowed to go gather/craft and level without that danger of being attacked, you have an extreme advantage that others don't, and in fact it completely removes huge interlocking systems build around defending towns from other players, needing to hire guards to protect caravans, needing to be careful where you gather components or guilds/players being able to claim and protect those areas.
It's an artifact of most every MMO coming before being focused on PvE, so I get the request, but it'd be similar to people being used to Doom, then they released Planetside and someone asks, "Can I have a version of the game where I'm only fighting computer controlled characters?" Not only would it make the game just not fun, as the core gameplay loop is 3 sides of players vying for territory, it's just trying to make the game into one that's already come before, when it's explicitly trying to do something new and innovative.