From keithlang his request below, be able to also export sub compositions as .vuonode files people can double-click to install.
Regular sub compositions should still be available, they have their upsides too.
If they could be protected against opening (as an option ?), that could sound as a way to Protect shared compositions and nodes [Save composition as closed composition] ?
PS : this started as a request to double-click regular .vuonodes to install them, until I realised that is already possible.