Often times when writing a macro or a function that should appear as though it's a part of a DSL, the advantage of turning off parenthesis can shine here. That's why parenthesis are optional with a lot of the Ecto macros.
Optional parentheses are pretty much a requirement considering how much of Elixir is actually 'just' macros. I'm very happy that the formatter adds them for me as much as possible though, because I'm also not a fan of how far Ruby takes it.
