Edit: Here is my current version. Please consider this instead. I have included a way to make this enforceable as a guideline and will allow less extreme overlap cases to be allowable.
[Guideline] You should avoid partially or fully obscuring a hitcircle under a slider-track in easier difficulties, because the hitcircle will always be obscured until the slider has run it's course, making for hard to read, and ugly situations. Any exceptions must have a clear and logical path, that is not obscured by any hitburst.
[Guideline] You should avoid partially or fully obscuring a hitcircle under a slider-track in easier difficulties, because the hitcircle will always be obscured until the slider has run it's course, making for hard to read, and ugly situations. Any exceptions must have a clear and logical path, that is not obscured by any hitburst.