He would sometimes bypass the crossover and drive the woofer directly to confirm his findings.
And his findings would be what? That inductors also influence the sound quality of the circuit? I would hope most of us are aware of the improvements to be gained by using air core inductors rather than iron core in critical locations within a filter.
I would say most DIY'ers are of the opinion that caps are more important than inductors in their destructive effects on sound quality. Possible reasons for this could be the variations possible in caps that isn't there in inductors and how the devices are used within the circuit. No DIY article that I am aware of glosses over the importance of parts selection, they just find more value in concentrating on certain parts with the largest perceived influence to garner the most words.