If you want a thing done well, do it yourself.
But it would be more accurate to say: if you do a thing yourself, you’ll probably consider it well done.
Because you are the only judge. You set the standard, you choose what “well” means.
Of course, that’s not practical and it does not scale. And so, at some point, you will have to work with others, who will bring a different perspective on what “well” is.
If you are open, that’s a way to progress and figure out that what you thought of as “well” was actually just “good enough”.
If you are closed, on the other hand, you will probably go on doing “good enough”, until it becomes obsolete.