I suppose that iwas my point. With the boomless the mast rotates automatically..you do not have to adjust the Rotation limiter. So the mast itself is not set...it resets as you lessen or tighten the main.
I found that very useful once the preset of the inhaul is understood for given wind conditions.
The over rotation device is no more complicated than the one many boomed boats use and the advantage of the spanner facing forward is obvious for mast stepping.

However, I did not understand the Nacra 18 was born with a boom. So, factory knows best. Also. using the main to set the mast can require monkey like strength.