A syntactic feature like this can only be judged in the context of the language. I'm sure there's languages where parentheses around function arguments prevent

A syntactic feature like this can only be judged in the context of the language. I'm sure there's languages where parentheses around function arguments prevent ambiguity, but there's also languages where it's very unambiguous, or the opposite might be true. For other examples of languages where invocations don't use parentheses for arguments, OCaml and Haskell. In fact, I'd argue that if they tried to add that feature to those languages (parens around arguments to a function), it'd make things very confusing given the way functions and tuples work.