The smaller battery is disappointing. Yep, the CPU uses less power but that only counts if your MBP is more or less idle. In the end, footprint matters and not thickness … Apple abandoned too much battery capacity IMHO.
When out and about, when do you need 3? Can't ever recall seeing someone at a coffee shop, conference, etc needing 3 USBs.
As I speak I'm using magsafe + thunderbolt2 + HDMI + 2 USB, 1 for peripherals and the other for playing back video.