I expect I travel in a much wider circle than you do. You may note my sideline in my first post and I don’t go chasing cheap. With my newfound knowledge:
Magnepan Tympani - Not hard to drive, though tube amps would struggle and older SS gear may.
901 - Does not tax a good modern receiver. Perhaps when they first came out it was an issue. ASR does not test 1970s SS gear.
IRS - Challenging in its time, but ASR does test amplifiers down to 2 ohms now, and that would be sufficient for the IRS
Plumbing the depths of what are at this point ancient speakers while not recognizing what tests are done does not prove your point. It reinforces my point that the goal here seems to be to find the one obscure situation where ASR measurements may not be correct, and attempt to use that as an excuse to discard all the work they do. Maybe that fools some people.