I agree that choosing 2 type A receptacles is more user-friendly. But since it's almost impossible to provide more than 10W through micro USB and as you already said shitty chargers and cables lying around will be used many Pine64 users will have to learn the hard way that they need a powered USB hub to connect external devices (like it's the case with Raspberry Pi often). Something that will add to the total costs significantly.
I would believe the Remix Mini makers (also based on A64 with the same connector choices) chose a 3A/5V PSU with barrel plug for a reason and I don't believe the consumption numbers provided in the wiki are close to realistic: http://wiki.pine64.org/index.php/Main_Page#Power_Usage
I would believe the Remix Mini makers (also based on A64 with the same connector choices) chose a 3A/5V PSU with barrel plug for a reason and I don't believe the consumption numbers provided in the wiki are close to realistic: http://wiki.pine64.org/index.php/Main_Page#Power_Usage