Of course its all mental. My aural acuity has not improved -- probably deteriorated a bit with age.
I didn't want to get too immersed in my audio perceptions. I feared that I would lose track of enjoying the music thinking about the sound all the time. So I stopped trying to hear finer differences after I became able to tell the difference between interconnect cables. That was enough for most of my system decisions. (I can't hear the difference between power cords, but I did buy some designer aftermarket cords just on general principles.)
But it would be a choice to make, since there is always some enjoyment in developing any ability. And hearing more would be a good match with an equipment upgrading cycle syndrome, should you find that an appealing fetish.
I didn't want to get too immersed in my audio perceptions. I feared that I would lose track of enjoying the music thinking about the sound all the time. So I stopped trying to hear finer differences after I became able to tell the difference between interconnect cables. That was enough for most of my system decisions. (I can't hear the difference between power cords, but I did buy some designer aftermarket cords just on general principles.)
But it would be a choice to make, since there is always some enjoyment in developing any ability. And hearing more would be a good match with an equipment upgrading cycle syndrome, should you find that an appealing fetish.