Tony, in fairness to Mr. Fong, he clearly stated numerous times that if you have access to devices capable of handling Adobe RGB to use it by all means.
He is not talking about the choice of
output colourspace but rather to capture in sRGB and then use sRGB right through one's workflow on the ridiculous assumption that if your monitor is incapable of displaying the gamut potentially captured by the camera then one should not even go there but restrict oneself to sRGB.
I use sRGB as an
output colourspace all the time - just not for nonsense non-logical reasons that Gary does.
Otherwise I prefer to work in as large a colourspace as I can - ProPhotoRGB.
The fact that no monitor or printer in existence today can either display or print the gamut of ProPhotoRGB is neither here nor there.
Knowledge is power.
However Gary Fong has taken a deliberate course of obfuscation trying to keep his intended audience ignorant of facts that might allow them to make decisions based on appropriate knowledge rather than the hopeless non-logic that he is shovelling.
Just as Andrew Rodney mentioned: shooting handheld with a 400 mm f2.8 will most often result in hopelessly blurred images - ascribing the result to the rotation of the earth is the dippy part.
Gary Fong is telling us that the result of our blurred images is the earth's rotation.
According to Gary Fong's logic no-one should ever use ProPhotoRGB because no hardware device can 'handle' it.
Tony Jay