Twison or Jailbird?

As converting a Twine based project into a JSON based one generally involves removing all Story Format specific functionality (like Markup based links and all Macro calls), I’m curious to know what exactly is gained by using the Twine 2.x application to create what essentially ends up being a series of Textual content “Passage” instances?

eg. Basically the equivalent of following…

{
	"Passages": [
		{"id": 1, "name": "Start", "content": "Blah blah"},
		{"id": 2, "name": "Hallway", "content": "Blah blah"},
		{"id": 2, "name": "Library", "content": "Blah blah"}
	]
}