‘1 in 9 twist is best’, but nobody makes a 1 in 9” twist? I have to give some credence to rifle manufacturers for knowing what twist is suitable for the ‘most commonly’ used bullets in a standard chambering. Yes, there will always be outliers with shooters, shooting bullets not commonly used with a given round.
It’s like the 1-14” twist in a 22-250. That 1/9” may not work well with max warp, 50 grain, frangible bullets. If one wants to heavies, they can get a custom barrel in whatever twist desired.
The ‘most accurate’ 7mm-08? Besides the rifle we have the shooter, ammo, scope setup and a few other things in the equation. I like compact rifles when hunting, often on the move. For me that’s my X-Bolt ‘Micro-Hunter’ in 7mm-08, or 284 Winchester.