There is a lot of variability in photography and there aren’t hard rules for deciding what makes a “good” photo. A good photo comes more from selecting a subject, in a particular environment, etc.
Taste is a set of heuristics for what's worked for the taster in the past. AI is very good at heuristics.
Your argument seems to be that because of this training, the result will be better art than the human photographer could produce. I'd say there's at least as good a chance that the training will make the photography worse art than the human photographer could produce.