MacBook... No wonder so few people use the right-click button. For me, that right-click is indispensable. It would hinder productivity to lose it, and people would be smart to learn how to take advantage of it. The capslock key is useful too, although less so because many page layout applications now allow you to set text as all caps. Although having that key available is sometimes quicker.
Speed and efficiency is what it comes down to. Just because most users do things a certain way doesn't mean they're doing it properly. I see coworkers constantly doing things inefficiently because they can't be bothered to do a simple online search to find a better approach. It's shocking, actually, because I've seen people stressed out, spending full days to do tasks that should take maybe an hour.
The point of input devices shouldn't be to strip them down to their bare useable minimum. I don't think we need over-designed keyboards with a million buttons, but there is a sensible middle ground that offers reasonable functionality. Removing an underused capslock key isn't going improve anyone's experience, but it will hurt those for whom it's useful. This is not to say I'm opposed to redesigns, but I think they have to be applied holistically and be sensible.