At bottom something is necessary to delimit expressions. Going from () to semantic indentation is trading one delimiter for another, isn't it? Not exactly dropping the parens for free.
Break or fixed width delimiters are different than enclosing delimiters.
There's no longer any parens matching.
And not 2 things to keep track of (notice how Bel is both using parens but also following a whitespace convention for readability--that is then stripped and ignored by the compiler).
And also, your program is never in a syntactic error state--such things no longer exist. Semantic errors are still there, of course, but a whole class of errors goes puff.
