Ohhh...boomless is a little different. My 6.0 had a rotation inducer bar (similar to the limiter) and the bar was at the base of the mast and could be cleated off to induce more rotation since it lacked the boom to push the mast to the side.

I guess there is really no problem for a small amount of time - but it does cause additional wear on the mast step ball and the rigging will be constantly flexed (where-as on a monohull the rigging is very tight and stationary and sees very little flex/twist while sitting still). Securing the boat to the buoy so that it weathervanes without sailing back and forth can be tricky (I thought I saw a thread on that recently).