'The plot'/'The story' is itself a boardgame?

You get a lot of comments about certain RPG gaming as 'that's just boardgaming' in gamer culture.

But what if the urge to prep a sessions 'plot' that goes from A to B to C is just as much a desire to do a boardgame? You want a fixed progression to occur.

Of course a lot of GM's seem to fool themselves at this point "But my player could look in the wardrobe and find a gold coin at B, thus making B2 option exist - see, I don't have a linear path! Plenty of options! Of course then they go to C after that..."

But if we ignore the relatively minor detours on the way to C, the whole thing has a boardgame structure, really.