Apple does give you the ability to install non-app-store apps (some without tethering), e.g. sideloading or enterprise certificates, although I agree it's not a

Apple does give you the ability to install non-app-store apps (some without tethering), e.g. sideloading or enterprise certificates, although I agree it's not as easy as flipping a switch. They should also provide a way to downgrade iOS via Xcode for those with a dev account, but that's another story.