I find it quite readable especially with nested logic. Here is an example:

https://github.com/elixir-ecto/ecto/blob/master/lib/ecto/que...

Edit: Just remembered another use case where function overload is used to override default implementation

  defmodule Downloader do
    use GenServer

    def handle_cast(:start, state) do
      ...
    end

    def handle_cast(:stop, state) do
     ...
    end
  end

Here, "use GenServer" imports default implementation of various handlers which can be overridden.

https://github.com/elixir-lang/elixir/blob/main/lib/elixir/l...