But you are getting into a debate that hasn't really been resolved in modern art either, this has been a debate in the concept of kitsch and collage, dada, Greenberg, photography, etc.
If you want to dance around the question linguistically, that's all fine and good, but there are people in the world who believe that art must be sold and there are people in the world who find value in it other than the fact that it sells. You've got the past and the contemporary interpretations of art conflated with the trends of culture. Plus, these circles weave and web together, people derive influence and inspiration from all sorts of places, art comes to mean different things depending on who is listening, who is speaking/painting/etc.
I mean, there is obviously either a rigid definition for Art which has no form in language and is thus inexpressible for all eternity despite the various shapes it may manifest as, or art is something else. No, just kidding, I have no idea what I'm patring on about.
Or do you think art is solely about self-expression? But then again, how can you express what you mean, if you don't control the output?
Very simple, low-skill artworks can be extremely powerful. Artworks that took 20,000 hours of practice can be dull.
A large part of mastery also goes beyond the technicalities of expressing, it's also about having a good eye for what is worth expressing and what is mundane/boring/etc.
But it basically boils down to: art [of all kinds] is tricky and takes a lot of practice.
https://www.flickr.com/photos/7474079@N02/
Boring isn't it? (Interesting as history maybe?)
The "what is worth expressing" is where creativity happens. Technique makes you a competent hack. It's not enough for originality. So it's misleading to think it's all art. Technique and originality are different skills. The best artists have lots of both, but they're not related skills.
(Software has the same problem.)
https://www.flickr.com/photos/7474079@N02/17227816585/ https://www.flickr.com/photos/7474079@N02/18470207921/
Interestingly, I feel the same way about many works on ArtStation [1]. The artists try to draw something "cool", like a fantasy creature, but end up with just a basic picture of a human with lots of greebles [2]. Lack of imagination is very obvious.
At the other end of the spectrum for me is something like Wayne Barlowe's "Wargate" [3], an image with a whole new visual language for what it's trying to say, or Paul Veer's pixel art for Nuclear Throne [4], with very simple technique but very imaginative character designs. Apologies if my taste is pedestrian :-)
[1] https://www.artstation.com/
[2] https://en.wikipedia.org/wiki/Greeble
[3] https://simotron.files.wordpress.com/2013/10/tumblr_mv4vmddu...
What do you classify as interesting?
My criterion for whether something is art is whether it changes how I see the world. I guess something like Wayne Barlowe's "Wargate" (referenced in a sibling post) doesn't change how I see the world. It's too far removed from my life. But the light in Monet's winter day...
See the highly popular /u/Shitty_Watercolour on Reddit or "Get Your War On" comics by Rees, David.
Practicing technique can be nice, but it can also hinder spontaneity and creativity.
The magical inspiration in art is something beyond technique. The way you practice that is to just live your life.
Lots of people hold themselves back from drawing, dancing, and singing because they are afraid of being judged for not having enough technical skill.