Forget the Sewers. It's an annoyance at best, I agree.
Sounds to me you like questing, but aren't a big PvP fan. For others, that's entirely flipped around, and the idea of having to win 2 battlegrounds (it was 2, right?) is a lot more pleasant than spending hours grinding through a zone that offers nothing of interest to them.
I'm happy to agree to disagree, as it's impossible to convince me that gating content behind different kinds of content is a good idea in any situation.
I do both and at first I didn't see the problem of winning two battlegrounds and on my main character I won them rather quickly. Problem is you depend on other people win.
Not for quests. Also quests and dungeons are both pve content so unlocking dungoens through quests and rep is not something otherworldly and is not in any way "different content".
But since you're happy to say you can't be convinced and you're disregarding stuff I don't see the point