Agreed.
This is where I think some people shake there heads at gun advocates. Every anecdote is fought over no matter how absurd.
Could you provide your citations? And so what if someone was surprised by a wounded person? The guy was reloading which gave others a chance to stop him. Also, if high capacity magazines are so inefficient and far more subject to failure that doesn't sound like a ringing endorsement for them. But I will wait for your source to comment further.
Generally magazines are the weak point of every design, even the best efforts of Browning, Kalashnikov and Stoner (especially Stoner) Magazine induced feeding failure is so common that the first action we train officers and troops to take in the event of the piece failing to fire is the "Tap, Rack, Bang" drill - tap the mag to make sure it's fully seated, rack the action to clear it, and squeeze (Bang!)
Every effort to make the M16 platform better and hold more rounds than the original 20 round mag the rifle was designed around has met with a certain amount of failure, until modern plastic chemistry got into the act.
Using aluminum mag bodies with various geometery changes got the USgov into the 30 round magazine business for GI use, and believe me, those mags were more of a headache than a working tool - lots of bolt over base failures to feed, mag bodies warping when loaded that prevented inserting the mag into the mag well, etc, etc.
We used to load 28 rounds instead of 30, strip the mags down daily and clean the insides, etc, etc - nothing gave consistent 100% feeding and function.
Going to the later plastic follower (non-tilt) helped a bunch, and still didn;t get to consistent 100% reliability.
HK & FN both made runs of steel bodied 30 rounders, great idea, but steel mags in aluminum mag wells in dusty environments equal pieces with too much play in the mag when it's inserted, which leads to failures to feed.
Canada came up with their own solution, the plastic Thermold 30 rounder, tested 'em some worked, some didn't, samey same.
Today, the Magpul company came out with their new plastic mag, the Pmag, and so far those have proven to be the real deal, to the point that before they were assigned a NSN #, troops were buying them with their own funds - no **** - and I've now used them in a few different environments with the best consistent reliability so far, but even they aren't 100%
Fast forward, there are bunches of different 100 round drum mags for the 16 platform - and not a one of them will run 100% with any type of consistency - the Aurora shooter used one of the most popular (Beta C mag) and the failure of that unit was a predicable as the sunset - I would never recommend the use of one of those mags for anything more than range day funtime.
There are good feeding standard capacity mags out there for other designs - AK 30 and 40 rounders manufactured in the former soviet are good stuff. Galil 35 round steel mags, likewise - M14, G3 and FAL 20 round mags are all great, but their 30 round cousins (especially for the 14) not so much.
Pistol mags? whole other story. All standard capacity 12, 13, 15 & 17 round magazines in 9mm for all the different manufacturers are all based on the original Browning P35 12 round 9 MM mag.
The design is great. Who made what when is the wild card, but if one sticks to Browning, Beretta, Glock, HK and SIG factory made magazines you're GTG.
Simlar pistols in .40 and .45, same as above.
Where this particular discussion (magazine capacity restrictions) goes off the rails is the premise that either limiting magazine capacity offers an opportunity for a bystander to intervene, or in limiting mag capacity you limit casualties - I'm not convinced of either premise, and even discounting the possibility that a cluster shooter is a trained end user (I can change rifle mags on the run w/o looking, on rifles I'm trained on) magazine changes are not a difficut skill to acquire w/o formal instruction. I have no problem imagining some nutjob sitting in a dingy apartment dryfiring and practicing magazine changes.
IMO, mag capacity restrictions are a waste of time.