The truth is that the OCS procedure can easily create unfairness - who is where when signalled, how fast it's signalled - by affecting when each boat can clear the line.  So blowing off a start largely blown up by the racers is to me a better option than pushing on.

But, unless I am misreading the original post, the “restricted finish” in this case is 2/3 of the way up the course and nowhere near the starting area. The only boats playing in that area are the 18s and the H16s would only be there when finishing. So, again, I’ll ask, what issue are we trying to resolve by restricting this finish?

Agree.  As long as it's getting our of RRoS ok.

Draftable has a button to download the compared version.

RRS 63.5(a) requires protest committees to find facts 'based on the balance of probabilities (unless an applicable rule requires otherwise)'.

Finding fault of a boat’s own is a conclusion rather than a fact, so it's a matter fo  logical reasoning and judgemt by the protest committee, but, as fa  as it's relevant, I can't see any reason to depart from balance of probabilities.

Maybe it would help the discussion along if you pitched up a concrete example where you would be uncomfortable with BoP.