In this article from April 12th 2019, "The 12 Most Significant Power Amplifiers of All Time" the PL400/PL700 came in at #4! The article is full of snobbery, but gives some valuable insights and history into how far we have come with power amps. Interestingly, the older the amp, the higher the rating (almost). If you take away anything less that 25 Watts Per Channel, there would be only 8 amplifiers. Power amps indeed.
Here:
http://www.theabsolutesound.com/articles/the-12-most-significant-power-amplifiers-of-all-time/
Here:
http://www.theabsolutesound.com/articles/the-12-most-significant-power-amplifiers-of-all-time/