I could never work for someone who felt this way nor could I ever have anyone on my team who ever said the words “good enough”… good enough never is. Sometimes you have to ship it, but nothing is ever good enough. You just run out of time.
I don’t know that I understand where you’re coming from. I mean, yeah, philosophically, constant improvement etc. If you haven’t fulfilled the design brief, though, it can’t be “good enough.” But once you have done that, you only eat into profitability or the time that would otherwise be spent on other projects (and thereby compromising those projects) by going beyond. Knowing to call a project finished - even when the idealistic part of you says more could be done - is an extremely important skill, without which budget and time management would be impossible. Furthermore, I really do believe that an experienced designer’s “good enough,” is roughly equivalent to a client’s “nice job.”