It's unfortunate that PSD files don't work with git because so much of the development and release process ends up being built around git (e.g. merging code into trunk triggers the continuous integration tests). If designers don't use git, they can end up out of sync with their engineering peers. As the author said, designers who code are at a big advantage, even if they spend most of their time designing.

As a compromise, we had some luck syncing the PSD files with Box and checking in the exported static assets to git, but it was more of a patch than a solution.