He explains things well generally, and then lists off a bunch of different examples, but I don't think we gets specific enough.
For example, he says, "I think my nigiri is still far from perfect: could use improvement to reach the perfect fish and rice balance with firmness and texture."
Why does this take years as opposed to taking standardized pieces of fish and testing by simply adding more or less rice to it. Why would this process take years?
I get what he's saying in general, that things can be infinitely improved, but why years and decades?