I'm not sure I know what you mean by "usefulness". I know that sounds weird, but they say they're not aiming to meet "standard principles of progress, universal

I'm not sure I know what you mean by "usefulness". I know that sounds weird, but they say they're not aiming to meet "standard principles of progress, universality and efficiency". So it sounds to me like the emotional/psychological impact on the user may be a higher priority for them than "good old fashioned productivity".