I certainly agree that it is more than just numbers.
In my own experience, using the same recording encoded at various MP3 bitrates vs the original CD from which I encoded them, and a playback system of reasonable quality, I can reliably distinguish between Redbook vs 128, 160, 192 and 256 (using an ABX plug in in Foobar). I have more difficulty with 320, usually getting 7-8 of 10 correct. Interestingly, I seem to do better with higher quality recordings (those with good dynamic range).
But in any case, my comment had more to do with your initial claim. I was just trying to clarify that even though you cannot hear a difference between the two, on an objective basis you most certainly are not hearing CD quality when listening to a 192Kbps file.
That's actually good new for you...no need to invest in higher res recordings!