In my opinion, Scala should be moving towards a clearer, more unified syntax, as demonstrated by improvements to implicits and underscore usage.
Introducing [] for collection literals, when those symbols are already fundamental to the type system, seems to me a violation of this principle. I believe it's a step backward, it adds unnecessary ambiguity to the syntax. #scala
https://contributors.scala-lang.org/t/pre-sip-a-syntax-for-collection-literals/6990