@nyev - It is not just dealers who are biased. We audiophiles tend to be prey to expectation bias, in spades. That’s what keeps the used audio market churning.
As to trusting what some guys you don't know say on the Internet, good luck with that. (Me, too.) Yes, there can be real information content; just let your own ears be the final arbiter. You don't know anyone's motivations, hearing ability, or really, even what gear they have or if they are catfishing.
I’ll just say that again, trust your own ears. If you want, invite friends over and do a single-blind test. You may find (as I did with some $$$ cables) that something theoretically not needed really is not needed!
I wish you good luck with it.