Having a pain point and validating it with a set of other users is a good vector for success. While that is true I have seen/heard/read many ideas that are brainstormed in a room and selected at random becoming widely successful.
Anyway, regarding food you could have thought about a machine/robot based solution, at least to begin with :)
I disagree. Many people lack the vision, or sometimes the same negative experience to understand that something needs changing, of people with the original idea. And people often default to the negative, in my experience.
Brainstorm Uber with a group of people and you'd get challenges that taxis already exist and are fine, that laws stand in your way, and that people wouldn't want to get in a stranger's car.
Or to misquote (I think?) Steve Jobs, if Henry Ford had asked his users what they'd wanted before building the Model T, they'd have asked for a faster horse.
Anyway, regarding food you could have thought about a machine/robot based solution, at least to begin with :)