Practicality...

I'm sitting here looking for an adjustment tool to spin the screw on a Holosun 507k (which is a great CCW optic, don't get me wrong), and it's making me pine for the raw utility of the entire range of Trijicon MRDS sights... the RMR, SRO, RCR, and even the RMRcc ...which have elevation and windage screws designed so you can use the cartridge rim of a 9mm or 5.56 round to turn them in a pinch.

The original RMR was designed to be mounted atop the ACOGs being used by guys at FOB Beyond The Pillars Of Hercules, and all subsequent MRDS optics from Trijicon carry those genes.

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