Likewise, compartmentalizing typing into various groups (alphabetic chars, accented chars, capitalized chars, symbols, punctuation, etc.) is logical, but mostly incompatible with just about any modern keyboard workflow.
edit : after doing some further reading, I realize I was judging it based on a completely incorrect set of criteria. It's intended purpose was for non typists, single-hand typing or "environments where conventional two-handed keyboarding does not work" 
Though even by these criteria it's poorly suited for any language not completely served by ISO-8859-1 (and some languages that even 8859-1 is sufficient for). This includes a number of European languages.
I'm not sure about having t, n, s on the weaker fingers.
Answering my own question, since it looks like this was designed for touch/pen based input, it would probably hide the keyboard: http://www.crockford.com/wrrrld/keyboard.html