Why doesn't automation of visual inspection work?

1) There are many needs. Too many. But they are all different. Every product is unique.

(2) Automation of tasks that can be done by humans and that humans can do better. No cost can be applied.

3) Visual inspection is subjective. There is no clear goal. Therefore, even after introduction, it is difficult to get rid of it.

There appears to be a lot of need.
But users can't spend the money. Even after introduction, they are not willing to part with their money.

This business is too dangerous not to have an answer to this question.