To be fair, Apple did charging way before there *was* a USB charging standard (back in those days, most things that had USB had separate charging plugs - eg the Rio Karma); the shorted D+/D- is pretty recent, and the more complex stuff even more recent. Back then everyone invented their own schemes.

The Belkin hubs I have have suitably sized power supplies (for 0.5A/port). Don't think they do downstream charging tho...