With tones, studio calibration is as precise as they can get it. I agree that .5 is fine for home equalization.
The thing that happens around here all the time is we start out talking about home audio, then a scientific genius pipes up about exceptions that are so extreme, none of us have run into them. Then someone starts applying studio standards, and then standards for peer reviewed studies. We fade from hearing with human ears to talking about expensive measurement mics… and pretty soon we aren’t talking about listening to a Beethoven album in our living room any more. The scale shifts so much, it’s impossible to satisfy the footnote brigade at all and they start saying I’m not “scientific enough”.