I think the seasoned audiohead is a good point, or blessed with good hearing or young ears.
What ever activity we do we get better at it and notice more details and fine tune within those parameters.
There is also the thing of listening to the music or the gear. I have become much better at it, an analogy could be a wine expert, but I am am not as great as some.
As a hobbyist reviewer I have to listen to the gear.
The last two weeks I have been studying for examination...