Heh, as the originator of that anime thread, I'll accept the stroke to my ego.
It generally boils down to the same thing though. People find a buzzword for whatever they think is wrong, it gets beaten to death and then used more even when it's been repeatedly shown to be utterly without merit. It becomes a code word for, "I don't like this, it sucks." Which, in itself is a fallacy since it conflates quality with personal taste.
There are several reasons that D&D does not qualify as a boardgame.
- Even if the map was exactly the same for every encounter, the existence of an ongoing storyline removes it from a boardgame.
- The purpose of the battlemap, the board in D&D, is not to play the game. The purpose of the battlemap is simply to adjudicate the action which occurs in the imagination of the players.
- Board games always (or nearly always) begin from the same starting point every time you play. D&D never does.
- Even if combat is played out on a board, the purpose of the combat is not to play that game on the board, but to resolve the actions in the imagination space of the players. In a board game, the purpose of the board is to be played on. Without the board, the game ceases to exist.
That last one isn't articulated very well. What I mean is, even though we break out the battle map and resolve the combat on that mat, the purpose of the combat in the context of the game isn't simply to engage in the mini-game of combat, but to further the ongoing plot of the RPG. Now, that plot could be as simple as, "explore the dungeon and kill everything you meet" that's true, but, I think, many times there is a larger narrative informing the action.