[cleberz]

That's one benefit, for sure.

The main reason for this was to allow each class to have its own specific behavior (specially when evaluating), pushing some work into the parser instead of the runtime, since a SubList is a list of lists while a SimpleList is always a plain list itself, so no need for ".plain" methods in the last one. This makes things faster and the cognitive load is not affected so much (on the contrary, probably: I feel the syntax seems more familiar in the end).