I doubt very much a designer or anyone else could tell whether an analog crossover has been replaced with digital if the digital is programmed to mimic the original analog.
we will never agree on that. which is ok.😁
if i play my best 1/2" 15ips tapes (or my top vinyl pressings) all analog verses through a digital step it will jump out. OTOH the more processed recordings will be less revealing.
will every room, system, signal path be equally revealing of a digital dsp step? of course not.