That already exists. Higher courts decisions then become considerations on appeal. Usually the decisions aren't just biased either but based on previous congressional rules and law, but there are a lot of times where congresses rules are ambiguous or lacking and has become so ineffective that justices have no choice but to make a ruling or leave people vulnerable.

Case law still exists in civil law systems. But it is merely persuasive, unlike in common law systems that have a binding case law.