Oh boy, in a world that is focused on productivity (aka deliver asap something even if it is partially broken) and not too much of quality, this can happen very easily.
ASAP? The watch had been in progress for many years and was even announced and demonstrated publicly 7 months before it started to ship. It was definitely not rushed out the door.
Sorry I was focused more on the making process than the actual product. This happens with software more often than with hardware. I started to work as a hardware test engineer back in the day, and I know how hard is to deliver something without problems like this.