If they fixed power (stop using USB micro B, add a power switch header) and SD card stuff (let me boot from USB), I would be so much happier with my pis. But as it stands they are really messy to work with.
Using USB micro B lowers the BOM while making the device accessible in international markets (regardless of what your local power is, everyone has USB power adapters). Personally, I'd like to USB-C, but USB-C headers are still hella expensive.
That being said, you can power a Pi by attaching the right cables to the GPIO headers:
