Half decent approximations work a lot better in generating the equivalent of a stock illustrations of a powerpoint slide.

Actual long form art like a movie works because it includes many well informed choices that work together as a whole.

There seems to be a large gap between generating a few seconds of video vaguely like one's notion, and trying to create 90 minutes that are related and meaningful.

Which doesn't mean that you can't build from this starting place build more robust tools. But if you think that this is a large, hard amount of work, it certainly could call into question optisimitic projections from people who don't even seem to notice that there is work need at all.