Another valuable benefit that can be critical.
A Zero Stop tells you where "home" is
without having to see it.
In situations of degraded light conditions and /or when he cannot afford to take his eyes out of the scope, the rifle driver can exactly confirm zero.
I will threaten people in a class if they get caught talking in "clicks" especially to or from a spotter. Valid reason to get pissey if caught twice.
Then later on one exercise while blocking their view, I will put random dope on their elevation and cover the turret markings.
Stand everybody behind their grounded rifles, give them range to target then give them X seconds to go to ground, I'D the target, put their dope on in "clicks" and successfully engage.
Now those shooters can reliably check zero or add dope when using clip-on NV or in the dark without illuminating their position. Ditto if their turrets are muddy, iced or pouring rain.
Still gonna dish out shit if caught talking "clicks". Do that shit in your head but only as a last resort.
This is valuable in producing well rounded rifle drivers that understand how their equipment works and how to use a feature to their benefit under stress.