I don't ever use a spotting scope to spot, only to examine more closely on stuff that is a mile or more away. Sometimes I can pick up game trails, or spot water or beds that they might be moving towards or from that helps me plan a stalk. Also if I am after more than a meat animal, to see if it worth the stalk or not.
Like Pronghorn, at a mile with 8x binos, I can not accurately judge the rack. But at 45x or 60x I can tell which Buck I want. I watched a buck bed down about 15 years ago at 3 miles...met him at the water hole the next morning about 10 minutes before sunrise...could not have judged him, found the water, nor figure the land lay as well with binos.