Don't take this the wrong way but for an interface expert Raskin doesn't seem to give much consideration to typography. While it might be innovative, I couldn't use that interface simply because of the bad readability…
IIRC this is the guy who pushed for graphical, user-configurable types in the original Mac - something that hadn't been done before ever. The software was an alpha release, it's likely that they went with whichever fonts were available in the environment they used.
Those are details that can be refined later. The overarching concept is great.
Later? He was working on this stuff since the 1970s. You'd think there's be something generally useable out in the wild by now.