Read "Why Courts Don't Work" by Richard Neeley, who used to be chief justice of the West Virginia supreme court. Courts don't work because a lot of people don't want them to work. If you could get a judgement in a week in a minor labor case, employers would have to obey labor law, for example.
Also, just as a matter of how the US legal system works, the presumption is that someone is innocent until challenged, whether by the state or by a private party. A prospective business could not file a petition with a court asking if their conduct was legal or not, since it's not really a controversy. But businesses will always do loads of due diligence with lawyers beforehand, who should help identify areas of legal risk.