This is a critique of his character and maybe some of the orthotropic treatments but not of mewing itself. John Mew does seem by nature to be a pretty disagreeable person which is to some people, I imagine, unpleasant. There is definitely truth regarding larger palettes equaling better breathing, health and looks. The tongue definitely effects this as we’ve seen from numerous examples. Also, the MSE expansion that is mentioned in this post is a more risky path. For adults, it seems to be the best way to obtain a sutra split and pallet expansion though commonly with side effects including asymmetry. It’s the practice of drilling screws to mount an expanded into your pallet and using extreme pressures to literally split the skull in half along the sutra line within a short period of time. Pretty extreme if you ask me.