Along with people, there are still certain elements that CG can’t quite get right. For example, water and explosions demand an amount of randomness that programs have yet to streamline (on account of it being, you know, random). This is why a lot of films still do their explosions in-camera.
And to make things worse … even if you do make your explosion effective, your average moviegoer has seen more metropolitan rubble than hot meals. Wiping out a urban block became dry and expensive, like dating a mummy with fancy tastes. And thus came a new era of effects designed to combat the same-ol city destruction … ironically used by every goddamn film at once.
Yes folks … when the aliens or mutants or robots come, no longer will they simply fire up their laser and hadouken mankind into an orbital crisp. Instead, buildings and cars and people will be raptured for just the time it takes to piledrive them back into the dirt like a toddler playing hamster-bounce. So why is this happening? Well, besides the aforementioned boredom factor, particle effects are way easier to deal with when you’re not trying to be random. No one can animate every little spec of rubble and flame by hand, so it’s way easier to program everything to flow in a single direction and work that into the plot.