John- I think the issue of 'treatment' in the recording venue is different than treatment in the playback environment, where you are trying to reduce the colorations that the listening room adds. I agree that room treatments can be overdone- when I heard that big Sonus Faber speaker with the ARC Reference electronics a few years ago in a dealer's 'uber' listening room, the entire atmosphere of the room was dead- it was unnatural and claustrophobic to me, and didn't sound particularly good, although the equipment was still impressive in a 'hi-fi' way. Look at the Trinity Sessions as an example- minimalist, digital recording done in a church, with tons of natural echo/reverb. As source material it is highly regarded (though I admit having not listened to it more than a couple times in the past ten years). Acoustic treatment in the venue would have probably changed that recording for the worse; but treating the playback room, judiciously, would allow the listening room to 'get out of the way' or in Jim Smith's parlance (who doesn't necessarily advocate heavy room treatment, but proper placement of the gear within the room), allow you to 'play the
[listening] room' more effectively.