Power of your optic isn’t really about seeing things further away, power is about seeing detail. And in all honestly optical quality beats power every time. I can see more detail at any distance with a pair of 8 power Lieca binos than with a cheap 20 power spotting scope. For me 8 power binos give the best blend of field of view and magnification and a lack of eye strain. If I need to see more detail at distance I’ll pull out a spotting scope. A rifle scope is simply an aiming device for a rifle.
The art and skill set of glassing for game is something that needs to be learned. It’s not as simple as looking through your binos. And there is a distinct need for several types of glass to do it effectively and there are techniques for each type of glass.
Within a thousand yards 8 power binos will usually give you all the detail you need. A spotting scope at that distance will allow you to see things like antler tines mixed in with brush. But generally when I’m using a high powered optic it’s either at a long distance or for picking apart thick brush at a closer distance. The rifle scope is only used when it’s time to kill something.