I couldn't get through all 109 pages of this resurrected thread, so if I bring up some points already discussed, sorry . . .
1) Worldbuilding isn't binary in its absence or presence, but rather is a continuum from light to heavy. I can't imagine any D&D product or game that doesn't include at least a minimum of worldbuilding, the core D&D rulebooks certainly give us a light touch of worldbuilding that are probably pretty common in a lot of home games.
2) Different products and different styles of games, including different degrees of worldbuilding, exist for gamers with different preferences. If you enjoy strong worldbuilding, or if you prefer a light touch, as long as you and your group are having fun its all good. Worldbuilding isn't wasted effort if the person doing the work is enjoying themselves.
3) Even when it comes to narrative fiction, worldbuilding can be valuable. Tolkien is a great example, his notes on the world of Middle-Earth exceed in word-count his published stories, including the Hobbit and the Lord of the Rings. But Tolkien enjoyed worldbuilding, and generations of fans have enjoyed diving deep into Middle-Earth lore. Not all fans, of course, some just read the Lord of the Rings novels (or watched the movies) and called it good. Do you need a working knowledge of the elvish language or the history of Durin's folk to enjoy the novels? Of course not, but for some, it most certainly adds to the experience.
As a DM, I enjoy worldbuilding itself as a hobby, and much of what I've created never sees a game table, although sometimes the depth of background has served to deepen the experience for my players. As a player, and a fan of literature and movies, I enjoy deeply realized worlds and nerding out over the details . . . up to a point (some of Greenwood's earlier articles on the minutiae of Realmslore were too much for me, but I know other fans enjoyed it). I've also ran, and played in, some very "light" games (in regards to worldbuilding) that were tons of fun.
So, anyone who categorically states that worldbuilding is a waste of time, in gaming or fiction, is full of it!
