Exactly, there's almost 100% selection bias in the cases heard by the Court. By definition, the case has already been interpreted differently by different lower

Exactly, there's almost 100% selection bias in the cases heard by the Court. By definition, the case has already been interpreted differently by different lower courts OR there's a matter of some urgency on the national stage (election challenges being a recent example) OR something else of extreme interest. The Court is asked to review somewhere around 7000 cases every year. Of those, they hear maybe 150.