Michael's article discusses solely automatic metering based on ETTR, but is there not also a manual approach of using the Zone system at arriving at an optimized exposure (one shot) at RAW (ETTR)?
Yes, but if
Live View can reliably automate this, why not profit?
There are indeed situations where you have to shoot rather quickly, because of some photographic opportunity passing by (a beam of light on the right spot, the head of the giraffe balancing nicely with the iceberg forms, or you name it), and in those cases I'd really like my camera not to pretend it is loaded with negative film - which seems the hypothesis of my canon DRebel matrix metering, leading generally to burnt-beyond-any-recovery skies eg.
And yes indeed, raw histograms
and flashing highlights based on those raw values
are needed as XXIth century tools as well.
Adjusting a proper exposure looking at the jpeg file or its values may be a bit like correctly exposing the polaroid positive hoping it will suit the negative part as well.
Because as good the raw converter is, when the raw data is clipped there isn't any info anymore and all that can be done is guesswork (but yes, some converters may guess better than others).
Does this discussion apply to the electronic viewfinder cameras?
Yes, because the sensor works the same way, no matter the viewfinder.
What may be a catch is that you'll see the tonality of the jpeg file in the viewfinder, making it counterintuitive to apply the right setting : a too contrasty scene will appear too dark and a low contrast scene may appear too bright (but as a side note, I would think that low contrast scenes don't benefit as much from ETTR as high contrast ones, because SNR is not a very constraining factor for those).