not to belabour this discussion, but can we be precise on what we are talking about here? ... what the myth is or isn’t -- i am not arguing, just clarifying
no doubt any speaker design and its resultant sound profile will play the same way given an input signal (or musical type sent through it)... its sonic fingerprint applies to all genres - 100% agree
but that is not what i see this thread, and the op’s query, is about - it is about which speakers (not design processes, not designs, but finished speakers) may make certain genres sound better or worse to listeners using them
i do not believe it is a myth that certain speaker makes are better (or worse suited) to certain musical genres -- it is not an accident that sonus fabers, spendor classics, harbeths, are more favored and more often owned by listeners of classical, vocals, acoustic ensembles etc - and cerwin vegas, tektons, jbl’s are more favored by pop, rock, electronica listeners... the market speaks, people aren’t deaf, they have their preferences as to what makes music they like sound good to their ears