Texas at least has the Constitutional right to be heard, but SCOUTS didn't grant them that, therefore IMHO they have killed Federalism and have rendered themselves moot and no longer have any purpose ...
The SCOTUS argument was that Texas did not have the right to act for PA, if I understoood the issue. Seven voted NOT to hear the case. Alito and Thomas wanted to hear the case but also agreed that Texas had no rights regarding the PA situation, so basically 9 to 0 against Texas. Isn’t protection of one state from the suits of another part of what Federalism is all about???