I'm glad this topic was brought up. Before I started TRT, I would never have known I had low T until I saw the numbers. I had an excessively high libido, no ED problems, etc. I started TRT because the numbers were low and after reading all the great benefits, I thought to myself, "why not".
It wasn't until I started, I then realized that even though I had a great libido, I had other low T related problems. After about a year on TRT, other people started noticing that I was calmer, easier to get along with, my thoughts were clearer and even though I didn't have ED, my erections were stronger. I was more confident, more outgoing, less depressed. I had the 3PM tiredness and that went away on TRT. I had fat accumulations on my belly and love handles that took about 2 years to go away. I had more energy, less lethargic, etc.
Did you see other benefits while you were on TRT? Maybe the ED problems were estrogen related?
