For me the cognitive effort is greater without the use of []. The meaning of the () following a symbol in a (define) is only determined by it's position. With [

For me the cognitive effort is greater without the use of []. The meaning of the () following a symbol in a (define) is only determined by it's position. With [] you can, at a glance, know the role of that list. It gives some visual separation to the parts of a function definition that most other languages just have automatically.