I'm aware of that.
I'm contending that the normally accepted 1 psi for every 100 RPM is not adequate, especially if getting oil up to the 1-2 rocker box is important. Al advocated for Hoover mods a lot - there is no possibility of a meaningful "spray" from either the rockers or holes in the pushrods with less than 10 psi of pressure.
Regardless, the vast majority of Speedsters and Beetles are not running oil pressure gauges, and people are relying on a light that turns on at 3 psi to determine of their oil is too light.
I know that you are gauged up, and know what you are doing @Michael McKelvey, but most guys here have zero idea what their oil pressure is. I'm advocating for adequate oil pressure for people with greater bearing clearances than you are running. In 90* weather, it's going to be difficult for those people to maintain adequate oil pressure with a 10W oil.
The 15W oil Lisa got for upstate New York will be adequate, most likely. But unless a guy has a decent oil pressure gauge, all of the discussion regarding adequate viscosity is conjecture. I'd rather advocate for safety than make a blanket statement that "yep, 10W30 will be great", and have some guy in Houston or Miami take it to heart.
BTW: the daily high temperature just a few hundred miles south of you has been over 90* every day for over a month. Even in the upper Midwest, we're hitting 95* more days than not.