In practice, while you are sniping, you can just put your binos beside your place. And you don't even need to holster your sniper rifle to use them, which snipers currenly do.
In many scenarios and cases, sniper can't afford a separate spotter, though he has a thermovisor, which any good optics obviously hasn't. Current bino\sniper rifle animation when prone - is too long. While you'd expect real sniper to just pick your binos lying beside and look at it.
Perhaps this is a small detail, but it's really essential when you have fast-moving enemy.