Some do but they are rare. I like to find a schematic and see the voltage rails to figure peak clipping. Add the rail voltages times .353 square that result and divide by the load. Say the rails are plus minus 50V that would be (100x.353) squared divided by 8 = 155.7watts peak without power...
fisher BA-6000 which has 60V rails.
A good way to know where an amp is at within its power limits is to scope the rail voltage and scope the signal while playing music and this doesn't take into account current draw. Also, this method mainly displays the amp's peak output signal. Determining...
It's not so much detail but the way they remixed the songs to build in loudness. School and Pigs now have an excellent layered loudness that continues to increase well into the song.
I agree, however with some of the modern Blu-ray releases like Crime of the Century, Animals and Quebec Magnetic etc. more power is needed maybe even 1000watts. These types of releases still don't sound too loud.
YMMV
KEF had it figured in the 80s. Good on access, off access and phase response. I like to add low distortion with 3rd\odd order lower than 2nd now too. Now a days that can be done reasonably. Back in the 80s it was harder. the NS10s are an 80s design.