In my experience, high capacity magazine serve little benefit in all but machine guns.
Three, ten round magazines, in the hands of a competent rifleman, can put as much lead down range as accurately and as rapidly as a highcap mag in a civilian AR-15.
The California, off-list AK-47 certainly benefits from a highcap mag but the rifle is basically a spray gun beyond 25 meters.
I don't totally disagree. However, if a single armed person wished to ambush a much larger group, I can see where not having to reload could be an advantage. I will leave to the imagination of the reader when such a circumstance might arise.