I am impressed that in this age of AI they still feel the drive to make watercolor paintings, to be honest.
Sadly, at this point I would not even call it a challenge, but I would consider it more a pastime.
How does the existence of AI make watercolor painting less of a challenge for a human?
Ai can't do anything like a good water color painting. Also they're physical, like any painting, they look different in real life
Why is that impressive?
I think I see where you're coming from but, from personal experience, AI has not much to do with one's interest in learning how to paint or draw. I've picked up drawing again this year not only as a passion but it's something I can create with my own hands. It doesn't matter that AI can do it and can do it much better, it's that I can do it. For fun, for relaxing, for meditating, ...