Pro Staffs are almost all between 67 and 70, and always have been, since early 90s, 6.0 85 and 90, 6.1 95 RF97A and PS97s, just like most top pro's Wilsons, Sampras, Federer, Nishikori, Tsitsipas, De Minaur etc were/are all at around 70RA
High stiffness is by default for a Pro Staff
Agassi had a racquet head, and sweetspot, the size of Jupiter, and was playing with - his words - "the heaviest frame and loosest tension you can get away with", while Djokovic and Murray, and others, compensate low flex with huge swingweight, 370-390, while this whole argument started in a way with your statement that sw of 325 is enough, and that stiffness isn't important at that swingweight. Sorry if I'm simplifying your initial sentence, I hope I'm not oversimplifying it