The 2.5x20mm on a .375 H&H or .458 WM is a nice case in point. Never a concern about getting poked in the eye with that scope. I don't know why they aren't more popular...
I just sold one to a fellow on here for his 9.3X62. They are indeed a wonderful scope on heavy-recoiling rifles. Bought a Leupold 3X to replace it, another good one for the same purpose.
They are probably not more popular because power is the paradigm of youth!
Ted