[citation][nom]soulkiller[/nom]Simple.... because USB 2.0 devices dont work on 3.0..... 3.0 works on 2.0 ... So.. thats why.[/citation]
That's wrong.
[citation][nom]ojas[/nom]Maybe because they're cheaper, so you could put more for less, and most stuff is still limited to 2.0 on the peripheral side of the story. Or at least, that's what i can think of, though i wish too that they'd drop 2.0 entirely now.[/citation]
USB 3.0 ports tend to require special drivers and have software issues far more often than USB 2.0 ports. At least without the proper drivers installed, USB 3.0 ports often don't work at all, so I'd hate to have a computer that had no legacy USB connectors to fall back on in case of issues. Basically, although I don't see good reason for a whole six USB 2.0 connectors, it wouldn't make sense to drop 2.0 completely. Having at a bare minimum of two USB 2.0/1.x connectors should be necessary for a long time yet and no more than four seems necessary to me.