Not a major issue anyway if you ask me. I mean say you have a Gigabyte UD4 or above and an sli/x-fire setup - your 'crippled' USB3 is still 5x faster than USB2, and SATA3 reducing back to SATA2 speed is only going to restrict the very fastest SSDs. No biggy. Besides, when this sudden need for full USB3/SATA3 speed arises for whatever reason, you aint gonna be gaming, so you can just switch to full-speed 'Turbo' USB3/SATA3 cos you wont be using your dual GPUs.
Or use an ASUS board. And I believe MSI use a bridge chip too.
Or use an ASUS board. And I believe MSI use a bridge chip too.