20 years experince, thank you for asking.

Oh, I assure you, my thumb fits in the chamber of either, and I can't tell the shells apart by feel when I'm fully awake. If we are talking about a defensive firearm, you might want to be able to do whatever you need to by touch if you have to. I don't expect people to be able to clean and strip blind folded, but able to find the right ammo and get them in is something I'd consider worthwhile.