I think this a result of survivorship bias by design, not that anything is broken. If a case had little effect, it wouldn't be worth the court's time. If a case

I think this a result of survivorship bias by design, not that anything is broken. If a case had little effect, it wouldn't be worth the court's time. If a case were easy to resolve, a lower court would have done so. So that only leaves important yet difficult and complex cases.