https://en.wikipedia.org/wiki/Maillard_reaction

It's the same reason we don't boil all of our meat. Cooking can provide flavor or not. Smashing, by causing more browning, provides more flavor.

ya I think initially I fell into the trap of believing this was a good thing, but then realized it was a cost saving/more revenue thing places were doing, also I have never been to someone house asking me if I wanted a smash burger for dinner, most people at home make regular trad burgers