I learned a hard lesson, have enough glass to see if your trophy buck has broken brow tines from fighting. Those large dominant bucks love to fight during the rut. Another issue is that during the rut, bucks are traveling, and you may not have the time to go back and forth between a spotting scope/binoculars and rifle acquisition. Your solution may be unconventional for the way you hunt. We hunt out of Tree Stands(lock on), climbers, or ladder stands.
Another issue is if you are hunting during the rut, learn to rattle and use a grunt call. Learning to call in Bucks is perhaps the best part of the hunt, and using a cover scent is helpful. They can pinpoint you to within 1* at 1000 yards! Having them come to your tree/ladder stand, stomp, snort, and scrape the ground is incredible to see! I have had non-shooter bucks come to my ladder stand and fight for up to 4 hours, they almost knocked over my ladder stand in Kansas. When all of this is happening, every doe in the area is there watching, so you have to act together on scent control.
When living in Az, we hunted off of mules and horses. We typically shot from ridge to ridge, which was 300-550 yards. I had a special scabbard made that was large enough to accept a Burris 6x-24x with Target knobs, knobs marked to 600 yards, then went to a Burris Black Diamond in 8x-32x in another scabbard, 7 mags. The Mule I rode would spot a buck in his bed every time. Deer never paid any attention to the mules as long as tack was not rattling nor people talking. I would turn the mule broadside to the deer, get off the mule on the offside, retrieve my rifle out of the scabbard, screw on the Harris Bi-Pod, and one shot and the deer was dead in its bed. Hunting partners did the same, and we drew straws on who was going to shoot in what order instead of competing for the shot. I never saw a Mule Deer buck in AZ with brow tines broken off from fighting, white tails in Kansas, Nebraska, Missouri, and SC are another story.
Like most of you, I have watched the video's of guy set up on one hill shooting deer and elk from a distance, observing with a spotting scope. I have not hunted that way, and I do not know of anyone that has hunted that way.
People in different parts of the country hunt very differently. When I see a deer off at a distance, I will pull out my Rattle bag and my grunt call is hanging around my neck. Part of the extreme enjoyment is calling in those large bucks to me,and they come! Of course, not all hunting can be done this way, especially in Utah on opening day! YIKES!