They don't even do statistical analysis. If they did, they would be able to put confidence limits on their classifications at least.
The power issue is a serious one. Last year we published a "hand-crafted" method for stereo vision for a gardening robot that was perhaps not quite as accurate as some deep learning methods, but ran happily on a Raspberry Pi, as opposed to a powerful laptop with GPU. The accuracy was good enough for the purpose of the robot not running into trees.
Biting the hand that feeds IT
