回複：ok, now we are back to square 1 again

First, Forum rule is about whether you can sue someone in the state you want to sue. Venue rule is which state court is the proper place for you to sue assuming the state has jurisdiction over the defendant.

Second, Minimum Contact rule is a lowest standard required by the Constitution. Some states have unlimited long arm statute such as California. In this case, the quasi in rem action is not useful. However, some states like NY have limited long arm statute. In this case, the quasi in rem action could be a gap filler. So if State B has limited long arm statute, quasi in rem action would still be useful.