Crosscut

Pipe operators are a tried and true way to achieve ad-hoc postfix syntax where you want that. But they are not common in languages with C-style/curly-brace syntax. There, . is pervasive.

However, . is not a general operator for postfix function application (at least not anywhere I've seen). Instead, it tends to be used as a special syntax for things that only support postfix syntax (like accessing the fields of a struct, or .await in Rust), or for method syntax (which deserves a dedicated note; let's do that tomorrow).

These different usage patterns, plus the potential confusion with . in Haskell (which is used for a similar purpose, but does function composition instead of function application), makes me think that . is not a good choice for a general "postfix function application" operator.