Don't forget Carrizo is supposed to be a SoC/dual-chip hybrid, what we're seeing here is the mobile SoC configuration. The SiP version of Haswell also has fairly restrictive IO, presumably to help with power consumption: http://ark.intel.com/products/81021
After all, there aren't many 'thin' laptops you can add extra hard drives or PCIe cards to, so the limitations generally won't be a problem. Note this low power Haswell also has less cache per core than the regular chips.