Have you ever reloaded a gun? Ever? Or cleared a malfunction? I'm assuming no, because you're, really, REALLY stretching with the above.
Regardless of what you think I have fired weapons and I have dealt with stoppages.
the most irritating one was a failure to extract the round by the bolt carrier. Other failures were much more easily corrected.
As much as you are one of the more reasonable firearms advocates, it doesn't change the fact that a video showing a person with ten rounds in 3 mags firing nearly as quickly as a person with one 30 round magazine also indicates that most people don't really need a 30 round magazine for their pistol. They can get by with 10 round magazines and practiced reloading.
In the most recent such video I've watched, there were demonstrators who were noticeably faster than other demonstrators. Yeah any person who isn't a total idiot can pick up a semi-auto firearm and reload magazines without much problem. However, a person who practices will be noticeably faster at it than a person who doesn't
I haven't really stretched the situation more than some of those videos do either.
Although to be clear my belief is that if the pistol comes with a standard magazine capacity then it shouldn't be arbitrarily limited.
For example if someone wants to buy a .45 caliber pistol that come with a 13 round magazine they should be able to purchase it in any state and keep it in their residence for protection.
Remember, the worst mass shooting in history (Virginia Tech) involved 1 10 round capacity pistol and 1 15 round capacity pistol. Because he simply kept his distance. You can do that when you have the initiative.
In that shooting there were also classrooms that people hid in. He could've slipped inside an unused room or into a stairwell and blocked the door while reloading if people came out to confront him.
Additionally if a murderer in a school is killing people and ducks behind a door it's doubtful that a typical person is going to just open the door, it'd be a risky proposition even for an armed person.