I think the problem is more that CGI isn’t as intuitive for people as messing with jello and pancake mix. CG is an incredibly, incredibly complex field with a large variety of techniques and hacks that range from intuitive to absolutely absurd and fascinating (to people who know what they’re doing). Modelling skin, for instance, is an incredible uphill battle because it’s semi-translucent, but computers are completely unable to realistically simulate light due to a variety of reasons. The solution is basically a bunch of weird trigonometry that in no way approaches how real light acts at a physical level but somehow looks right enough that you don’t notice.
Modelling and simulating the fluid dynamics required to render that breath in the cold? While there’s probably a tool for it now, getting that tool in the state it is now probably required man-years, if not man-decades of mathematical and technical breakthroughs.
Pixar spent a long time just developing the insane interlocking spring mechanics governing Merida’s hair in Brave. And most of these probably aren’t even close to accurate simulations, they’re a bunch of bizarre ad-hoc computationally cheap hacks that look very good, but would be useless to a physicist studying physical mechanics in any depth (some things are reasonable, if coarse, simulations, but there are so many hacks).
The Wildebeest Stampede in The Lion King required a new custom-made computer and brand new software to do what’s known as a flocking simulation and it still took like a year to compute. (Yes, I know the last two were animation, but live action CG and animation have a lot of overlap in tooling)
That said, it’s hard to have an appreciation for the huge variety of techniques and skillsets involved in developing CG tools unless you’ve gone so far as dabbling with GLSL, Pixar’s Renderman, read up on computer graphics, and know other things about simulation programming. It’s still a fascinating art, but it’s more like painting where nobody really cares about how so and so artist used drybrushing to get that texture, because it requires a lot of foreknowledge to know why certain techniques are used. It’s less intuitively fun that hearing someone Macguyvered gore or a sound effect, but I still feel like it’s a shame that peoples ignorance of the field ruins it for them compared to practical effects. I’m not using “ignorance” as a value judgment, the amount of knowledge you need to understand a lot of it is immense, it’s an unfortunate ignorance there’s no tractable way to disabuse anybody of.