False. So what and only marginally true.
They make 30+ round magazines for handguns. Glock makes a factory 33round magazine.
You can measure a firearm's power a lot of ways. By many measures a 45ACP, 44 Magnum can be comparable. Not in muzzle velocity, but stopping power for sure. Energy will always be higher in a lightweight high velocity round because KE = .5mv^2
Finally, you can easily modifify many pistols to full auto, and there are pistols built full auto. Google Glock 18. Just like an AK or other "assault rifles."