There's also this really weird fear in that industry of open-source anything. A while back, I was investigating security options for PLCs (in the light of e.g.

There's also this really weird fear in that industry of open-source anything. A while back, I was investigating security options for PLCs (in the light of e.g. stuxnet), and while Siemens and Rockwell do ultimately feature such things, there was always a lot of "you can trust our security schema, but you can't trust that open-source stuff, anybody could put anything in there". There are very good reasons to use PLCs, that the Arduino PLCs completely fail to address. But I'll bet that a lot of criticism within the industry will come down to "its open source, so you can't trust them!".