The "10 psi per 1K RPM" works well in part because the manufacturers have cleverly sized the journals to provide enough bearing speed (opposing rotation) to make local (at the actual journal surface) pressure high enough - far more than the relief valve and gauge pressure.
This is one reason why slow-turning engines like the 235, GMC, Pontiac L6 have such large journals and safe operation with low gauge pressure - it increases local pressure from the same oil pump output.
Yes, that might be dangerous if using Honda 48mm rod pins, the local pressure is proportionate to the pin radius so 1.89" vs. 2.20" (BBC) is 14% less - with the same gauge pressure and pump output volume in GPM. Luckily there's a considerable safety margin or there would already be many loud noises!
