The army of "researched, data-backed experts" behind you is imaginary. So instead of repeating the same appeal to an imaginary authority I'd advise you cite a s

The army of "researched, data-backed experts" behind you is imaginary. So instead of repeating the same appeal to an imaginary authority I'd advise you cite a single good UI research study where a slower site-specific shortcut is better that a more common faster one when "time is of the essence" (and whatever else you think is based on "expert research")