This would be what I ideally think should happen, a product hits a happy place and is finished.

It seems, though, that when working in a business that you'll have many users with many use cases, you'll be competing with other software companies, the temptation is there to add the one feature more to please the user or compete a little better.

this becomes a very specific problem each group of developers / business must answer and maybe the ideal case becomes less realistic to achieve or at least have a general answer for.