Because every target sounds the same and don't give me that BS about sound nuances BS
Not at all. The nuances are very real. Before the forum moved to this new hosting platform there were many discussions of the nuances and how to pick them out. Unfortunately, much of those are not findable here and you need to go to the way back internet archives to find them.
The original Tesoro forum also had many discussions on the nuances and the very real differences in the edge sounds of roundness, clickyness, drawn out edges and mixed or bouncing edges.
Pick up a copy of Clive Clynick's book "Pulsepower!: Finding Gold at the Shore with a Pulse Induction Metal Detector". Clive talks about listening to the edges and modulation of the beep. In his Excalibur books he also talks about the narrow and drawn out signals that are the same type of characteristics that can be discerned with beep and dig detectors.
Several years back we went to an old property to hunt and have a family picnic. Youngest daughter, who was 13 or 14 at the time, tried her hand detecting with a Tesoro Compadre. After about half an hour she was telling me about the different sounds on the edges. Neat thing about that is that I have never talked with her about listening for the nuances, she discovered that all on her own.
As I get older and my hearing is not as good, it is harder to hear the edges; that doesn't mean they are not there.