Feynman's views are where we should start but in life, decisions have to be made (or else made for us). In my professions in law, real estate and finance as well as medical and food decisions for family, I have to have conclusions I can act on. So, based on the information I have at the time, I make a decision. I've forgotten more than I know.
As to an all in one system, it serves the purposes for many or most music lovers. For me, I chose to collect the music I want to hear often first, then the equipment to best enjoy their reproduction. I am not a perfectionist, just an average guy who is a polymath intellectual. It's my orientation, not my intellect that drives me to know more.