Part of the problem is that Apple doesn't follow the charging spec standard. Luckily, I don't have any Apple products that I want to plug in. I'm mostly just looking at all the dorky little things in my life (e.g., Fitbit's charging hub / base station), which just don't work when you plug them into anything other than a "real" port.

However, you're indeed correct that it would be nice to see a USB hub with a large enough power supply to at least ostensibly supply its maximum current to every port simultaneously.