L-N shoulder plane instructions match. I lost my neaderginity to a L-N medium in all its out-of-the-box glory; arriving at piston fit M&T nirvana in what I was fairly certain was an illegal act.
And tho' perhaps not traditional use, I'd offer a third, that the wider blade allows working L>R, R>L to deepen a dado.
As for the new-old debate, if you don't agree with me then you are EVIL! I'm sensing a trend .... and we can add shoulder planes to the banned list.