For a while now I have been thinking about this question.
It never really seems to come up in the online tutorials or videos I tend to consume, and the question of "is it good enough?" always feels like a limiter on my own progress in Game Development.
After thinking about this question and the self perception that "I'm learning so therefore it must not be good enough", I resolved to make a blog post about it:
https://itch.io/blog/902526/when-is-it-good-enough-learning-gamedev
It's a little long, but is based on my own experiences of Game Development so far, and made with the hope of helping others to understand their own limits and anxieties around learning game development.
I haven't overcome my own yet, but I feel like I at least understand them better, and that I now know what I need to do to push past them.