Now that we have an HTTP API, people are asking for show config operation, but the current format can only be parsed by libvyosconfig, which means it must be installed on the client machines for that command to be any useful. Exporting to JSON will make it easy to obtain the config data and use it in scripts.
It can also come in handy in scripts people run locally. Maybe ability to retrieve a config and convert it to a dict can even be used in migration and commit-time scripts.