Something being intentional doesn't necessarily make it not bad.
The movements being smooth achieve the reverse (for me) because then the smoothness is easily tuned out, as opposed to the real world sections where the low frame characters contrast against the higher framerate environment (Such as particles from a fire) and are a constant reminder.>>157413072
3D animation is smooth and fluid because it's supposed to be. Traditional animation typically intentionally cheats to simulate missing information while conserving effort(When it's not limiting the amount of information displayed by basically using stills), naturally captured footage can retain information because the light that is captured does not cease to exist between frames so that whatever is capturing, be it film or a sensor, is still being exposed to light constantly(At least this is my understanding) but 3DCG does not naturally retain information of a movement when the frames of an animation are limited.
So 3DCG either has to cheat like traditional animation would or include the easily accessed information like natural footage would.
This does neither and jittery CG without supplements is not good at replicating traditional animation styles, it doesn't feel like 2D anime that would cheat as opposed to presenting the frames as they are (which in this case would equate to effort) and it's not much an investment of effort to have very high framerates for animation if the actual framerate is already that high.
Being able to more effortlessly copypaste and animate assets and pan the camera is a boon (When handled well) but it doesn't have to be the only one.
Also I get that this is mostly my opinion and I'm just going to end it here because anything more is just going to be about whether something does or does not feel right and then you truly enter the realm of completely subjective opinions.