I don't think that's a particularly useful mental model for how these work.
The models end up being a tiny fraction of the size of the training set - Stable Diffusion is just 4.3GB, it fits on a DVD!
So it's not a case of models pasting in bits of images they've seen - they genuinely do have a highly compressed concept of what a cactus looks like, which they can use to then render a cactus - but the thing they render is more of an average of every cactus they've seen rather than representing any single image that they were trained on.
But I agree with you on taste! This is why I'm most excited about what happens when a human with great taste gets to take control of these generative models and use them to create art that wouldn't be possible to create without them (or at least not possible to create within a short time-frame).
If you think AI will never catch up to anything a human can do, you're simply wrong.
- "Class Lessons: Who's Calling Whom Tacky?; The Petite Charm of the Bourgeoisie, or, How Artists View the Taste of Certain People", Edward Rothstein, The New York Times
This article also discusses a painting called "The Most Wanted" which was drawn based off a survey posed to ordinary people about what they wanted to see in a painting. "A mishmash of images from it's training set," if you will.
Claiming that others lack taste seems to be a common refrain--only this time, instead of a reaction to a subset of the human population gnawing away at the influence of another subset of humans, it's to yet another generation of machines supplanting human skill.