I'm not sure that would be considered universally true. I can think of many instances where high frequency waterfall data would be useful....it just would never be useful for cases involving EQ.
I would probably use the energy time curves for determining the effects of acoustical treatment. While it would be nice to add some filtering to reduce the influence of noise, and to identify the spectral content of reflections, the ETC as it is provided is still useful enough to see the effects of treated reflections (it just isn't sufficient for surgically treating the problems).
There is a control for a smoothing filter on the ETC graph page so you can smooth out the noise. No octave band filtering though (yet ).
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