Well, most of the time, I shoot my ARs off a benchrest, and I
like to hunker down and keep the rifle as close to the surface of
the rest as possible for stability. A 30-round magazine is too
tall, and forces me to raise the rifle higher off the rest.
In fact, for slow-fire, precision target work, I prefer to use a
5-round magazine as it hardly protrudes from the bottom of the
magwell.
