Unloading the chamber is the reason so many companies use 2-position safeties that don't lock down the bolt: They can get sued if the safety has to be off to cycle the bolt, and somebody inadvertently pulls the trigger while they're running rounds through the chamber during unloading. (I've never understood why so many shooters feel they need to chamber every round, all the way, when unloading a rifle, but many do.)
The other factor is that 3-position safeties are more expensive than 2-position safeties,
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
