My main issue when trying out Veo 2 was that it felt very static. A couple elements or details were animated, but it felt unnatural that most elements remained static. The Veo 3 demos lack any examples where various elements are animated into doing different things in the same shot, which suggests that it's not possible. Some of the example videos that I've seen are neat, but a tech demo isn't a product.
It would be really cool if Google contracted a bunch of artists / directors to spend like a week trying to make a couple videos or short movies to really showcase the product's functionality. I imagine that they don't do that because it would make the seams and limitations of their models a bit too apparent.
Finally, I have to complaint that Flow claims to not be available in Puerto Rico: "Flow is not available in your country yet." Despite being a US territory and being US citizens.