usually not fully bearish on any tech but I really do not think calorie counting using purely vision is ever going to work. way too much variance in preparation methods that afaik cannot be picked up visually. 200-300 cal. margin of error is the difference between maintenance and gaining 1lb/week

As a type 1 diabetic I can say that at least eyeballing carb counts is very doable and becomes second nature after a while. It's obviously easier if you prepare most of your own food but eating out usually isn't a problem.