Mmm, I mostly generate scenes, not people, and when I do, it's always in a not photorealistic way. It is true that newer models have more details, I think that I put that into 'slight accuracy improvements', is it really major? Or is it mostly for close up people/animals and it is likely that I just didn't notice?

It will be wrong on a lot of details. Basically you would get a market scene that feels 18th century gb, but will use 18th century russian/french/Austrian details, or 19th century/20th century British artefacts, or a mix of both. And the further you go from western places, the higher the error rate is. Basically generating fiction scenes. That's pretty much my usecase, so that's fine, but I won't ever use it to illustrate a historical TTrpg.