People tend to overestimate their talent, and get overly attached to their own ideas. So when a tool like midjourney/stable diffusion generates beautiful artwork based on a low effort prompt from the user, it's comfy to think that they had a big part in it.

The reality is that almost everything those tools make is equally gorgeous/amazing regardless of who uses it, so they're effectively interchangeable. As a tool for personal expression, it has a lot of value because of the impact it can have on the individual using it, but as art it's pretty worthless. A generated AI image could potentially have some cultural impact or value, but not on the merits of "it looks pretty", since they all look like that.