ORIGINAL: GMMAT
But humor me.
As long as you sighted your bow in.....and shot from the same position (in re: to plumb) every time.....whether or not your bow's level was "level" (bubble in the window) wouldn't mean anything.
Correct?
True enough, but the way you stand on a hill is so different. You really can't tell if you are doing everything the same.
It is easier for those whose living requires them to know plumb and level. I do have that back breaking privilage.
The point is if you need it then knowing what you need based on your bow is necessary. Site manufactures need to provide it. Guys need to let them know. Another answer would be independent pin adjustment horizontally.