Punches very obviously not connecting suggests it's been trained on Hollywood fight scenes. The other giveaway is rapid hard cuts and shaky camera so you can't see how badly the punches are not connecting. Everything feels weightless and fake.
There is a lot of AI slop, but I wouldn't discount it being able to do something decent with the right person at the helm.
I think this is untrue. Every movie I've seen does a pretty good job of hiding that gap...you can see it with a sharp critical eye, but if you're not paying attention it looks convincing. The Higgsfield stuff looks AWFUL...any idiot can see it's fake and impossible. Also, how could the author help it? AI is the author. It already has good training data. If your assertion was that it will look like hollywood, give or take 50%, I'd agree with you.
My assertion is the gap is 4-10x wider and more exaggerated. AI is a pattern matching tool...it matches and generates based on it's training data as you stated, so it's a miracle if it improves on the training data, but if it's 10x worse....well....we're going to be waiting for this to impact movies people actually care about. Some late night SyFy slop?...eh, possibly, but even then....this stuff costs a lot of money and looks like garbage today and no one likes the end result...so I can see it help with some shitty background scenes where they just don't care, but I can't see it replace the cast or core film anytime soon.