Background: I was running around this evening trying to burn off a small stack of surveys and idly popped into a delve because I hadn't snagged the skyshard in there for some reason. It was a delve that I had done with different characters, but it had been a while and took a few minutes before I got my bearings, but needing to get my bearings prompted a question.
Expansion zones have dailies which point to all delves in the zones (even if they have to make up three reasons to send you to each of the two delves in order to get six dailies), all World Bosses in expansion zones have dailies (even if they have to make up three reasons each to send you to the two WBs to make six dailies), and all World Events in the zones which have them (Blackwood/Deadlands Oblivion Portals excepted). The base game has dailies which point to all the World Events (except in Cyrodiil) and all the Public Dungeons (except Coldharbour's), but only 15 delves out of the 90 in the alliance zones, no dailies at all pointing to Coldharbour, and DLC zones don't have dailies for their Public Dungeons. Craglorn is a bit odd, but I think everything has a daily, just not a central quest-giver.
In practical terms, this means there are 75 base-game delves which are one-and-done (do the story, beat the boss, snag the skyshard, and never return), 18 Public Dungeons in DLC zones which are also one-and-done (do the stories, beat the boss, snag the skyshard, and never return), plus Coldharbour (the whole zone is one-and-done zone with nothing except mats surveys or Treasure Maps to send you back). There are also 90 World Bosses in base-game zones which get dusted off during a couple of events (Zeal and Witches), but are otherwise one-and-done unless you're farming something in particular.
Did the devs ever comment on the reasoning behind this? That's a lot of development work for a lot of one-and-done stuff.
I'm fresh out of outrage, but I could muster up some amused annoyance if required.