Mods like (Skinned Mesh Physics) for Skyrim Special Edition have set a precedent. They prove that with enough dedication, a ten-year-old game can have facial animation fidelity that rivals modern releases.
: Version 0.5 allows for manual control over every part of the face, including the jaw, lips, eyelids, and brows. true facials mods
The best true facials mods walk a tightrope: they add biological realism without exceeding the animation skeleton's original capacity. Mods like (Skinned Mesh Physics) for Skyrim Special