Great video.
One thing about that board design that sticks out to me, apart from the mentioned issues, is the USB-UART IC. It appears to be powered solely from the 2.8V rail. Don't those things need a minimum of 3V? Due to the D+/D- signalling levels being 3V. I suppose 2.8V is technically within tolerance, but it's marginal and I wouldn't rely on it. Also, if it's one of the USB chips that has it's own LDO integrated to create the signalling voltage, then minimum VCC will be more like 3.3V.