The charging standard is a pile of fuck, rarely obeyed, and is really stupid actually. I think USB-C only partially solves the problem... dodgy Chinese chargers designed for MacBooks will probably happily send 20v to your phone and brick it.
@elizafox As evidenced by the excellent and thorough (but seems to have gone on hiatus since half a year back) Google Plus blog-ish by Google's USB-C champion Benson Leung:
I've run into micro-USB cables from Apple that only have wires for power, not data. At least they *looked* like Apple cables, might be Chinese knockoffs