He is saying that people post on-axis anechoic response graphs because this is what the audio industry has sold as important for decades, even if it is not a complete or correct scientific assessment and most of the industry doesn’t understand or believe the science.
Yes exactly.
One of the simple but stupid reasons that many began repeating "measures good, sounds bad" is because the dominant way of presenting speaker performance was one on axis measurement alone, going back as early as the 40s, maybe earlier. Rank insufficiency at best.
Until TS parameters became widely known in the late 70s and research about off axis response was accepted in the 80s it seems like most designers were doing a complicated but largely random version of guessing.
I've been reading D'Appolito book on loudspeakers recently. Published in 1999. He begins it by saying that all the book really is at its core is a compendium of knowledge scattered in patents, journal articles and other places. Back then I imagine most audiophiles relied almost exclusively on hearsay. Bred a culture of rumormongers, if you ask me.
I really like what's going on now, like the availability and demand for information.
I'd buy a Klippel if I could just to add to the "library" online.