> Alas, how would I tackle this issue with a kid?
by teaching them that work is good and necessary. There's a book by Neil Postman Amusing Ourselves to Death, the central idea of which is that "form excludes content". The problem with Youtube, or in his time TV, isn't just the content, it's that all content by the nature of the medium must be entertaining. If it isn't entertaining, it isn't content.
Hobbies feel like work because they are like work, because most things worth doing have a component of work to them. Rather than just trying to see what sticks, the best thing you can teach kids these days is that they should stick to the thing and that expecting "fun" at all times is a bad expectation to have.
Also there's a period when you're going to feel terrible if you're focusing too much on the result, when you know enough to judge the quality, but not practiced enough to do it well. That's when positive feedback is important, either by reducing expectations (just doing it for fun), focusing on relative progress instead of absolute qualifications, and mental care. A social element works wonder for these.
But sometimes you're just tired, right? I get working on a hobby project on the weekends, but I can't fathom working on anything after a 10-12 hour workday