Even as the static images have gotten a little bit better at avoiding the most obvious failures (e.g. "oh sweet Jesus the hands what is wrong with the hands???") all these programs are still converging on a very specific and very off-putting aesthetic. Its the same reason the prose tends towards the same ridiculously corporate tone: averaging together all the creative works of human history spits out an aggressively average product based on what went into the training data. But applied to the visual arts what we end up with is just. Not bland like oatmeal, but bland like cardboard.