I absolutely agree that Fog Creek needed to support Git, but I don't think Harmony sells meaningfully more than Git-only + hg-only would've. That's why I refer to it as a cute feature.

Fog Creek's emphasis on how they achieved git support steered the discussion to be about the value of git/hg interoperability, rather than the value of Kiln for corporate developers. And it seems like the consensus is that git/hg interoperability is, at best, a nice-to-have.