Though the article isn't about the act of painting, I just wanted to encourage anyone who wants to get into art to check out the Procreate app. It makes it so much easier and faster, though you don't end up with a "real" painting (this is an advantage sometimes).
Having an undo button makes "painting" much more fun!
Speaking from second hand experience, not having an undo button can be a lot of fun too because it can inspire you to paint something you hadn't intended to when you started out, or force you to try what you were doing in a very different way. What started as "mistakes" can end up being your favorite part of a painting.
That said, painters also have a lot of options for fixing errors including repainting over the whole canvas. The few painters I know often revise old works adding or removing elements months/years after they were first finished.
It seems like painting in general is a lot of fun "real" or otherwise, although personally I've never been any good at it, it's still usually a good time.
Honestly, I undo so much in Procreate I never get anything done. I'm best with it if I start with a rough in actual pencil, snap or scan it, then finish it in Procreate.
Having an undo button makes "painting" much more fun!