I don’t think Arsenal counts as the change. Even Arsenal’s idea of “physicality” is more subtle, delicate, and melodic than anything on Southpaw Grammar. The sound as a whole changed with that album. Songs became louder and distorted and for the most part had remained that way until Jesse Tobias came along and devolved the sound even further. He’s only now getting back into a more mild tone but Tobias has to go before the true change can come.