What are your thoughts on releasing a quest with every major piece of content released? I definitely think Tempoross and the Ruins of Unkah should have been behind a quest. There is so much lore potential there and I really enjoy the idea of unlocking content like this behind a story. This is why I am so on board with story mode for ToB (and all future raids going forward please). Edit: also wanted to mention another good example that I know cannot be done now, but Wintertodt being locked behind The Forsaken Tower would've made a lot of sense in hindsight.
I don't think every piece of content needs locking behind a quest. In fact, in some situations it would actually be a bit odd from a storytelling perspective to need to do a quest first. That said, I'd love to one day be in a place where every big update has a quest attached to expand upon the lore. A Taste of Hope is a nice example. It wasn't required for the Theatre of Blood but it still came out a similar time and had some tie-ins.