Not to nitpick, but they're not in high school in spite of the way they all act. They're college graduates. I really didn't understand the Gunblade until I found the Ultimania explanation while browsing the internet. And even then it's a bit far-fetched. Surely there are many weapons that are a lot simpler to produce while also being more efficient?

Also for both FF7 and FF8, the ability of the characters to survive hundreds of bullets to the face during battle sequences. Well, if they survive Blizzaga then why not bullets I suppose.