> You can know whether the aesthetics of something does or does not work without being able to determine why.

You can no whether or not they work for you without knowing why. But the nature of subjectivity is you can't know whether they work in a more general sense without analyzing the elements of the thing in question against an accurate-enough picture of the distribution of tastes in the population.

You may know if you like a particular dish, but would you think your sense of taste is good enough to pick enough dishes to make a successful restaurant? Probably not, especially if you don't know how to cool.

Just because you like or dislike a particular creative piece doesn't mean that you have what it takes to dictate a piece of creative work that will be exposed to millions of people.

No, but you could probably pick a restaurant to cater your wedding, which is more like what OP was describing.

But that feedback isn't too helpful without specifics like "too salty", or "too runny".