Far be it for me to get in the middle of a budding 'discrepancy'... So I will.
Actually that feature was extremely easy to find in the C1 trial. I never knew about such a feature in LR until now.. I was first looking in LR's "Edit" menu and didn't find it. In C1, it's right there, and far more flexible. I could see this being quite useful in client-type situations exactly like the OP describes. But that ties directly into C1's strength in regards to it's renowned tethering capability in a studio for likely portrait photography.
I had to google about LR being able to do this.. In a million years, I would have never figured that the small, tiny 1-line text boxes could accept hundreds of words/filenames.
Myself being only interested in landscape and art-type photography, whom will likely never have direct clients, will likely never find it that useful. But for portrait photographers I could see it being used almost daily (but I gather that's what John probably had in mind about 'limited task').
Although points taken in regards to the otherwise labyrinthine menus, and C1/Phase1's over-the-top hyping & marketing -
and about LR's far more powerful DAM features.
Each software could certainly take note of each other though, IMO.. C1 'choking' on a mere ~3000 image library when moving around in folders and collections, and not understanding DNG spec (LR's HDR/Pano merged DNG's, for instance). And LR could take note of C1's color editor, and including levels/curves
AND the color editor in local adjustments. ... Well.. this could get long on both sides.