I have Fajen thumb hole on a mauser 270.
I had it slinged on my shoulder and tripped in the lava rocks. The rifle ended up keeping from falling into a large crack in the lava. The barrel, scope and stock got dinged really good. It wore the scars for years. The very next shot accounted for a rock chuck at about 250 yards.
I'd venture to say that the thumb hole is stronger that the standard sporter for structural integrity.
The other great feature is straight back recoil if designed w/no drop at heal which helps to spot the shot...
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!