How do you feel about, say, The Fountain?

A joke. And a seminal piece of art.

There is also a controversy with that piece by Duchamps; there is some evidence it was by Elsa von Freytag-Loringhoven.

I got to see copyright discussions here on how AI can reproduce similar art works much faster than a human.

What if the definition of art is applying some paint to a canvas?

I don't understand your question.

In my experience, copyright and IP law have been leveled against me in employment contracts more than than they've ever helped me maintain a grip on my output. 'Intellectual strip mining' is a good way to put it. The definition of art hasn't protected what I do and changing it probably wouldn't affect that.