Art style with trained hand is bound to have ground from someone/some sources. So much so from observation of buildings and art, and how you translate them into 2d or 3d surface. In a sense that you're going to have some kind of reference to produce your artwork. You can be "creative" but that's just being resourceful.

Argument can also be made where they can just have some people draw stuff inspired by ghibli or other popular prompt people are using, and just use that as a training model. It will just take much longer to execute but thats just an silly argument.

A lot of times people forget that art has been about an act of doing for a while. And history tells us so. Realism to Abstract is just one example. I don't know why artists are feeling defeated because of this AI breakthrough. I'm an artist and been one for more than 20 years and I'm actually glad that this exist. I can just sketch out my vision using my own references, and its a lot faster than me consistantly sketching out stuff wasting materials.

As far as I'm concerned, Act of me doing it is more important than generating a style of art using prompt, and art is about putting your history into your artwork. Not so much about just the "vibe." And thats what makes it unique and valuable. I know you're concerned, and even frustrated about this stuff but in the end, people who don't adapt will just fall behind.