(Node-RED project lead here) It is not at all limited to prototyping. There are an ever-growing number of companies incorporating Node-RED in their own products and services - you can see a list of some of them on the project homepage.
They span a wide range of industries and technology areas. Quite a few are industrial controller companies who include Node-RED on their commercially available edge devices.
They span a wide range of industries and technology areas. Quite a few are industrial controller companies who include Node-RED on their commercially available edge devices.