Honestly, this is one of the few things I could do away with in Solasta. Though it has more to do with the awkwardness in execution than anything else.
I am sure the BG3 devs have already considered this, and our only example thus far is the aforementioned critical hits, which is even more awkward because the visual of the die rolling 20 takes up too much of the screen and the cinematic goes so fast that you're left wondering what you actually saw at the end of it. Spells targeting saving throws inherently cannot critically hit either, so you'll never see such a cinematic while casting those. Still, I think the BG3 devs are determined to make it work eventually, like how we get cinematics for talking to every single NPC, even if the majority only have one line of flavor text. It just shouldn't be a big priority right now.
