To be precise the phase alignment in question is not in the recording, amplification, but in a multi element speaker where the speaker element placing and crossover design affect the time alignment of the output.
Mr. Dunlavy was an RF engineer, reportedly, and in the RF world everything is objective and measured. I heard his speakers in the early 90s in a hifi show in Miami FL. They sounded better than most offerings there. Too big and too expensive for me back then.
You can use squarewaves to measure the timealignment of speakers. Time alignment is one of many factors in sound quality, and a pretty obvious one.
Following this logic single element speakers would be better but they have their own issues.