I certainly see your point Larry, and I also would agree with John. I see them as each a "crossover" feature .
Of course keep the feature in the Library, but have the hybride of the opposite. So both having the same features now, but in hybrid. The dominant being the same, but the added feature of the opposite.
I honestly never used the 1/3 across a group of images, and maybe I never felt the need, but sure see its use...YET, I would like at least the exposure and the main adjustments to be a available with sliders as an option to adjust while browsing around in the images, and then go to full dev after evaluating the images. I guess this thought came to me after needing it and I got tired of doing all the multiple clicking and then using the >> which is a 1 stop, and finding that often to be too much in multiple clicks , etc.
In the end, its all digital, how hard is a flyout set of sliders tools in one module vs a set of linear stop click tools in the other module :-)
I have to admit, there are much more important Must Haves :-)