Clearly you overlooked the point that a lot of USB 3.0 chip-sets don't work with many of the arduinos or are hit and miss to say the very least.
I prefer the current selection of ports rather than adopting a new one that many people cannot use.
The USB connector also varies on the source as the clones have been moving to the micro connector for the UNO's.
The forum is littered with posts about non connecting or intermittent connecting boards of many types with a selection of connectors...The standard fix for anyone with those issues is to insert a standard USB 2.0 powered hub between the offending USB 3.0 and the Arduino.
Just some context.