I think you all need to let him tucker himself out with what he knows/doesn't know.
Spining/FLO'ing may be of no real consequence, but if I had the capacity to do it, I sure would. Because it MIGHT be of some consequence, and I would be pleased knowing that I had removed as many little variables as I could from my set up. Take it from a single length player - removing variables is NICE.
I'm just surprised that manufacturers haven't caught on to this. You'd think they'd be tooting the horn of any perceived benefit they could sell you on. PING irons... Now with spined/FLO'd shafts! If you don't have yours built this way, you're a CHUMP!
Sort of suggests that even they are thinking it's negligible. I mean, if it wasn't, they could charge $10 more per club with absolutely no material investment.
Who knows. I dig it. I'd love one less thing to wonder about.