There is no truth to this. Speaker sensitivity has no more to do with sound quality than amplifier power, which is zilch.
John,
Your statement is as one sided as it is inaccurate. How can you possibly say that speaker sensitivity and amplifier power have NOTHING at all to do with sound quality?
Perhaps you do not regard distortion, resonance, dynamic range and accuracy at typical music SPL's as being in anyway related to sound quality...in which case I could understand your extreme position much better.