Got to agree. I would be nice that all zones are available and you can explore and by exploring I mean you don't need a quest to unlock a optional dungeon you just find one and be like : Hey, haven't seen this place before

You get in q and you get in and if later you find the quest for the dungeon you just did could be an item an NPC need that you get from completing the dungeon so if you kept it you can just give it to them and completle the quest or redo it IDK

The main story is fine but all the optional content is tied to it and sometime its optional content that is needed for the main story like with the CT raid if you wanna get to HW for exemple

An other thing that I think is that the optional quest dosen't reward you much for people to really be into it. could give some gear coffer pieces that could be interesting that give you idk a chest lv93 coffer