What is being blocked? States are still sovereign and can largely run their own affairs. If MA wants to, let's say, give people free public healthcare then TX can't do anything to block it. From a legislative standpoint there are only a few areas that are totally under federal control.
There is a compelling argument that with the state of remote work, familial mobility and whatnot, it is not feasible for the states to tackle certain issues without unconstitutionally blocking non-state residents from using those services.
