[dinkumthinkum]

The premise here is pretty weird. There is a whole branch called philosophy of science. You can't just say something that is wrong or untestable is by default is philosophy.

Also, physicist have proposed some experiments and observation such as regarding the cosmic microwave background radiation. There is a book called "The Trouble with Physics" and many articles on the subject. There is something to be said about many claims in theoretical physics and the lack of testability but I think this is not rigorous enough and too loose with the labeling.