Encoding and decoding of JSON usually adds huge amounts of boilerplate (in some small-to-medium-sized apps it might account for more than half of the LoC), and

Encoding and decoding of JSON usually adds huge amounts of boilerplate (in some small-to-medium-sized apps it might account for more than half of the LoC), and separating an app into modules requires you to add some boilerplate in your update functions.