We were never ever going to have the scope to go through making every single quest in the game completable, especially the smaller ones.
Instead, we identified quests which lock access to significant pieces of content, like a boss or something, things iconic to an area and did what we could to actually make that content accessible and more streamlined for players to understand.
For example: It would feel weird to not have access to Vorkath in Fremennik considering he's one of the most significant pieces of PvM content in that area