Oh, I completely agree (Living room HT myself). One of the worst things I ever did was measure the FR...Sorry, not picking on ya. You said "For many that's the starting point." This can become quite a chase for people with circumstances similar to mine, with a near perfect outcome only in certain places in a room.
Many people like me do not have an optimized listening area so it's futile to seek theoretical perfection.
I'm just saying that response would have been better for @mixma to read and understand, and I hope he saw it.