I suppose if I strictly hunted from a stand or blind I could justify forgoing optics. The only animals I would be interested in would be the ones sauntering down the path toward my manicured, pre determined shooting lane. My favourite hunting method is still hunting and spot and stalk. This is what Asbells book focuses heavily on and why he emphasizes quality optics.
Optics are not only for long range glassing of sheep or goats. I have picked out blacktails and elk 50 yards away while still hunting that I had failed to see a minute earlier while scanning the brush with the naked eye. Beyond magnification to erase distance, quality optics gather more light, bringing animals sitting in the shadows to, well, light. This is especially critical during the first and last hour of the hunt.
This is coming from a western hunter, but I would never intentionally leave my binos at home, even for a short hunt.