Because they’re not red hot, gettit? Cheese aside, there’s an advantage to working on several things in parallel. I’m not against extreme focus, but if you’re the type to be scattered, scheduling creative stuff in blocks—or just picking up where you left off when you notice the thing—there are a couple advantages to it and you don’t have to apologize or despair for this habit.
People asking what your thing is might want a pat answer. Sometimes, there isn’t one: you do a lot because you’re interested in a lot. You’re a Carl Sagan of art. Sagan was an astronomer. But he also wrote books. He hosted and co-wrote a popular tv series. That series spanned geology, physics, and chemistry, among many other things, as well as astronomy.
Having many creative loves, or many ideas that demand you work on them now, is perfectly fine. Maybe you could finish a thing sooner if you focus on that one thing. But would you have as much fun?