I agree with all points, and feel that it's up to the competitors as to when to race/not race.
But in reality, it would seem that unless the PRO pulls the plug, many of us will consider racing in conditions that we shouldn't be.
Since the PRO will take the heat for any decision, at least one based on something objective like design parameters might help.
And if it's a national-level event, one would presume that a wider range of conditions would be acceptable, like Karl said