The Good Enough Dilemma

When do you decide something is good enough? Or does it need to keep being improved?

Once it's decided that it's good enough, you've just given it an end of life. It may not be immediate, but it still has an end of life.

But when you decide it can still be improved, you are extending the life span.

Sometimes it's best to decide something is good enough, so it can be retired and you can move on.

But if it's something of value, it's best to continuously improve.

So do you say it's good enough and then move on? Or do you continue improving something?
It depends on the situation.