Node-RED is great for the industry in PoC's or in none-critical processes. Some companies using Node-RED in critical processes, too.
Open Source is a part of Industry 4.0, but we need a bit more and better testing and a reales managment for industrial software packages. That is what PLUS for Node-RED wants to provide for the industry. Better tested Open Source cointribution packages. More documentation and tutorials.
The costs of doing fixes and feature development just once and with a safe and secured release management. Just stable and working soaftware should reach the process or your machines. The team of PLUS for Node-RED takes care about it! From those points you get a huge costs saving. Use it!