look harder it does have the angle and ofset mushroom
To be honest you could get away with out the angle if you made a mushroom that did the angle and ofset centre. From what i can see the angle is there so that th ball joint runs on its center. If you didint have it the ball joint will run at a constant strange angle putting all sorts of strange forces on the wishbone.
Its debateable but if mnr mk etc etc do it there must be a good reason