Bart: I know all that, but also have had many years experience accurizing rifles and found what I wrote to be true. Pressure points can reduce amplitude of barrel vibrations, causing different bullet weights and loads to shoot closer to the same POI. As I mentioned, all of my rifles are free-floated, except for my 10-22, which needs a pressure point to keep the rear of the receiver in firm contact with the bedding.
Incidentally, that rifle shot 10 consecutive 5-shot groups on one sheet of paper, averaging .37". There aren't many of those that will do that.
“God save us from people who mean well.”
― Vikram Seth