Counterpoint: this YouTube rant by an animation person called Noodle is a pretty good overview of why frame interpolation sucks. https://www.youtube.com/watch?v=_KRb_qV9P4g
Basically, low FPS can be a stylistic choice, and making up new frames at playback time often completely butchers some of the nuances present in good animation.
If you are a good director you can make the most of that low budget. Look at the first episodes of Scum's wish (https://www.imdb.com/title/tt6197170/) if you want a good example.
Animation is the worst use case for motion interpolation because the frames are individually drawn and timed by the animators to achieve a particular look and feel.