It's true, but once something like that enters the public mentality, big makers figure out how to imitate pretty well while making everything else cheaply. If not inevitable, it's at least likely. Remember before Indochino when surgeon cuffs meant you must have a bespoke suit? That's what "The Secret Vice" is focused on. My point is, using some essentially meaningless thing like buttonholes to reassure yourself of the untold artisanal handmade man hours that went into your coat is both an exploitable strategy and a missed opportunity. Not only do you expose yourself to potential trickery, you (not you specifically dirnelli, I know you have a great appreciation for all the finer aspects of tailoring) trade the pleasure that comes from noticing a particularly nice lapel roll or a well cut shoulder for the hollow and tenuous satisfaction that your suit is "better quality" than everyone else's and the hope that someone else notices. This distortion of values is the main reason I think these "rules of thumb" are often counter-productive.