I think it's nothing unusuall at all.
Why? In mobile device when You connect subparts it's normal that You don't have full-speed on all channels (SPI for example) - That's not a way of designing battery operated devices. Other factors counts more than that.
Finally - it's not a network switch where it's network performance defines it's usefulness.
You tweak connections to fit devices needs and at this point is browsing the web, listening to streamed music, receiveing an e-mail - so that's what device is design for.