I was surprised by my almost-panicky reaction to seeing: Identifiers Can Have Blanks open_window_with_attributes(...) becomes: open window with attributes (...) I think I actually felt that wrongness in my stomach. Like a more intense version of seeing our corporate network shared drive's files with spaces and parens in them. I guess I'm old.
EDIT : Also, i see quite the opportunity from wrong parsing, not on the machine side, but on the human side. blanks already have a function in other programming languages : They are here to separate symbols. By giving them this double meaning, you actually bring context in the parsing of any piece of code, which i think could be a pretty painful exercise.
Other version : Don't design a language version because it makes code easier to type, if it doesn't also make it easier to read
(I know the author thinks it easier to read, but i'm not yet convinced about that)