If it doesn't then it's probably because:

1. The scope can be mounted lower and closer to the bore line if there aren't any sights or rear sight ramp in the way.

2. Since it's primarily designed for the mountains, the designers must figure that it will be used for shooting across passes, canyons or low lying areas in-between steep hillsides that could cover considerable distance, and shooting at more extreme angles that would be best served by mounting a scope.
Many bull barrel and varmint rifles don't have sights. They're also intended for accurate shooting at long range and mounting a scope to accomplish that is the norm.