Just do what pleases you. The old school audio obsessed purists would have everything flat from source to speaker so you hear as near to the original recording as possible. I suspect this started when most rich people listened to classical music.
All I would say is you might want the option to turn off the tone controls so you get the best of both worlds. Yamaha’s pure direct is a fairly extreme example as it seems to stop everything (I think it turned off my toaster the other day) but just a ‘defeat’ button would suffice.
Only useless until some idiot breaks the internet for everybody eh?
(wink)