So I've been playing Sims 2 for something more than a year now, and I've only just noticed that sims will, if at all possible, avoid doors/doorways that are set in diagonal walls.

I thought one of the great architectural selling points of the game was the use of diagonal walls for things like doors and windows? So why do the doors not work (sims will exit the house, walk all the way around, and enter the room from an outside door) and certain windows disappear? (They are treated as buy mode objects, not build mode, so if a family needs to move out and move back in again, suddenly half the windows are gone.)