Because you are. If you agree that the difference is minimal, why the F*** did you feel you needed to jump in and correct what was a generalization (and presented as such) of the analysis with a bunch of picayune details. Does it matter if the change ratio for spoke length to CTF distance is sometimes more like 9:1 than 10:1? Will it in anyway affect the final spoke length calculation?

When someone says the sky is blue, I don't pull out a Pantone color chart and say it's not exactly blue, some is this shade and some is that shade, and some is more gray than actually blue.

Like so many of the debates on this forum, the most words are wasted arguing about fine points that are immaterial in the scheme of things. My post #9 was simply to lend a bit of perspective so that those measuring could spare themselves a bit of unnecessary grief, and focus on what matters. You, however, insist on focusing on small differences that will disappear later on anyway, and therefore, as we both agree don't matter.