IMO, barrel peeps are a recent creation, made to cater to the market/folks that either:
want an "EZ" solution
don't know how to properly use a peep
own a rifle unprepped for a receiver peep
want a 'no gunsmithing" solution for a non-prepped rifle
I personally have no use for a barrel peep, for exactly the reason given - it's located too far from the shooter's eye for fast/effective use, the reasoning behind the design of a peep sight.
The peep sight should be looked through, not "at", without actually seeing it, and simply placing the front sight "on target" beit game or bullseye.
The smaller the aperture, , the slower the use - but the better the accuracy.
The larger the aperture, the faster the use - but there's a slight loss of accuracy, many relinquish in the interest of speed.
I usually completely unscrew/remove the apertures from my peep sights after zeroing, and hunt via sighting through the resulting "ghost ring".
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