I don’t know that we really differ that much in our theories concerning arrow spine.
What I’ve witnessed is that most folks use the programs and/or spine charts to FIND an arrow that is correctly spined for their bow with a field tip. And there is nothing wrong with that, it works great until you slap a broadhead on the arrow… then the dynamic spine changes ad the arrow is weak, compound this with the fact that in their quest for speed many shoot an arrow that is borderline weak to begin with. Now there is no way to make the field tips and broadheads hit together without altering the flight of the arrows by moving the rest out of centershot or turning the bow down until the spine is better tuned to the broadhead.
The few individuals who do utilize a slightly stiff arrow will have a slight differential in POI with field points and broadheads but usually it is not enough to worry about.
My personal philosophy is to shoot a very stiff arrow for the short distances such as 50 yards and less; tuning my point weight and fletching size for the best groups at 50… then the field points and broadheads hit together…
I also ain’t a speed freak, so I have no problem using a wrench on my limb bolts to correct any aberration in POI.
I do utilize properly spined arrows for target shooting at distances over 50 yards as I have found accuracy to be much more critical of spine at longer distances.