Do you regularly challenge to hear differences within any parameter of analog playback?
You're skeptical but is it you don't have method for challenging your knowledge with your own system?
If you haven't been to local dealers to audition new gear and systems or enjoyed a return policy with major online audio retailers, you can't say you've built a reasonable scientific method system to test your own theories...or to test your own skepticism.
"I don't know" doesn't validate your skeptical position. It challenges you.