EXACTLY!

Consider a professional one design race of Farr 40’s. In a 10 boat race… the perfectly sailed boat coming into the port tack lay line at the first mark and the equally well sailed boat in first place on the starboard lay line have the same rating.…. Port is tied for first in performance … However, this perfectly sailed boat will be 10th around the mark as the 9 starboard takers line up head to tail forcing him to sail to the end of the line. The variance in the portsmouth measurement rating is a function of a "sailboat race conducted according to the RRS. The nature of fleet sailboat racing is such that differences of 6 secs per mile or about 15 sec’s per hour can be expected simply do to sailboat racing variables. Slackwater provides some real world examples of time delta's in one design races where the time differences between first and the fleet or first and second are attributed to both the sail boat racing noise, plus sailing factor noise. Since these are one design data... they do not include differences caused by the boat design
So the variance is greater then 30 seconds per hour

In order to reliably detect a performance difference between two classes of boats or a design advantage within a class, you must have a real difference of double this noise value.

What this all means is that statements saying Portsmouth handicapping will be more accurate (when and if we get it right) then measurement ratings are simply wrong.

If both systems are working properly ... they are equally accurate and the precision is about the same.

The issue is that Portsmouth handicapping is simply broken.

SCHRS or Texel ratings are not broken plus they are transparent and timely.