Any time legislatures have a hard time defining the line between legal and illegal behavior, courts tend to take a “we’ll know it when we see it” approach. Justice might be served but rule of law is diminished.
Not really. “Fictive” just means “not real,” and courts have processes for judging whether things are real or not. The fact that courts still have to judge the actual facts of the matter doesn’t mean the legislature isn’t doing its job or that rule of law is diminished. It’s no different than courts judging the truth value of claims in a murder case or a fraud case.
a major difference between continental law and common law is the intent of the law though.
If the court can prove that they did not handle with the intent of the law, it can still be decided that this is fraud. In a common law system this is not possible.
Common law is based on precedent and common sense application of the law, so it is generally common law systems which are described as being open to interpretation.
Common sense has nothing to do with common law after a couple generations morph any type of sense a law could have made into something nigh unrecognizable. Go digging through case law in different jurisdictions and marvel at the contradictory interpretations that arise. This is why strategic changes in jurisdiction are a valuable part of litigative strategy.