[summner]

They've addressed that in the post. To make git work comfortably especially on bigger repositories you need to have fast local access to all blobs. IIRC with something like libgit2 its relatively easy to implement what you describe but to make that perform while doing git log or diffs is completely different story.

[justinsb]

It isn't clear that they wouldn't get that same performance by caching the blobs locally. In my experience, you would, with much higher reliability and scalability.