Actually, that is not true and you should speak for your self and not "most users."
The picture from the ERIS model shows to NOT touch the phone exactly where I touch my iPhone when on a call.
I hold my phone in my left hand with my thumb on the left, my middle finger, ring finger and pinky on the right, and my index finger where the apple logo is on the back of the phone.
There is the picture from the ERIS manual, and right where they say NOT to put your fingers is where my index finger would be while on any phone call.
Different strokes for different folks.
And I do believe Apple DID man up by holding a press conference about the issue AND offering free cases. No other phone maker has done that to my knowledge.
But hey, if it ain't good enough, like Steve said, return it.