The other thing hobbyist vs career is you can solve problems the way you want and take the path of least resistance at times. "Man I'm a bit overwhelmed, I'll learn that later, let's do this for now." And you're done and that's probabbly ok for a one man show / dude just playing with a hobby.

Career you're going to have to jump those hurdles... doesn't matter if you're in the mood or do or don't want to. Sometimes for really dumb reasons too. It's great for growth and learning, but it is a very different experience.

I did a bootcamp with some folks who had been doing web development as a hobby for fun for a while. Many of them really didn't adapt well to suddenly HAVING to do things new ways. They were comfortable with what they knew and were surprisingly resistant to other things. Granted that happens in every job / career but a comfortable happy hobby suddenly can become something else. We had a lot of "No man I get that worked for your javascript game but we're not hard coding all that every time ...."