That is assuming the signal of a person speaking is the same demand on the amplifier load as a cannon blast during the 1812 Overture, isn't it? In the same way that the peak range between a person speaking and that cannon blast, I would have thought most amps run out of steam to hit the full dynamic range...hence why many audiophiles who experience high quality 1000 watt amps often note there is a new-found freedom they rarely experience with 100 watt exceptional quality amps.
I am not saying there are not 1000 other reasons to prefer that 100 watt amp...but somehow I would have thought that in the same way race cars handle certain tracks better than others, etc...(even though they all drive 'pretty fast'...that amps also have certain things they do better than others...and thus, as the extreme level of performance, there will be those times when certain music plays to the strength of the speaker or equipment better.
Again, I am talking about extreme performance, not about good or great performance.