Firstly, I have done a quick search and have drawn a blank on this issue.
I guess, as a beginner, my board and I will become separated quite a bit, so it would seem to make sense to use some sort of a leash to keep it close whilst I sort out my kite. (And yes, I have been taught to body drag tack up wind

)
Do people use a legrope or leash on their boards, to stop them wandering away after a stack? If not, why not?