@immatthewj
I think your ear can train your brain, and your brain can work with your ears to look for more details. But it truly only matters with discerning systems, "anyone" can hear the difference between a bluetooth pill and and car radio. We are in this hobby because we look for the perfect sound. So you can probably hear a lot more than you think :)
I remember your example from Colombo.
I also like Andrew Jones’s explanation that everything is determined to be flawed from the source to the speaker and what engineers do is fixing errors along the way. (Paraphrasing)