I'd imagine that the taught typing method is less tiring over a long period of rapid typing than other methods. I would think that capitalizing would be a pain only using two fingers while maintaining a rapid pace, but I'll admit I've never tried it. I've always thought it rather derpy looking when people type with two fingers, but it's interesting that it's so popular. Maybe my long fingers made it easier to learn as a kid, as I think is one of the main reasons why people have issues learning home row young is lack of reach. I remember thinking that reaching 'b' with the left index finger was the worst idea ever back then, so smaller keyboards for young people would certainly be helpful.
I don't want to just feed the derail, so, uh...
Large Projectile Hitboxes
I've noticed this mostly in TF2. If the huntsman arrow were, say, a line segment instead of a two-by-four, I doubt half the barely aimed headshots would happen. The same goes for stuff like the pomson's cloud of unavoidable electrojizz. Projectiles like the flare and rocket are small enough that you can at least know the person aimed when they get a direct hit.
Edit: Oh, the huntsman's not exactly a two-by-four, it's just that TF2 uses the projectile hitbox on it, meaning that all classes are modeled by a giant cube surrounding them with the upper area being the headshot area, including volumes of empty space surrounding the head. Brilliant. And because there isn't a scaled hitbox for each class, scouts get hit like they're the size of a heavy. RAEG.