The reason industrial PLCs cost so much is because of their reliability. They need to be working flawlessly 50 years in the future. Trying to vibe code your way into a PLC compiler feels like it could blow up in your face after a little while.

That is also ignoring the safety PLCs with safety instructions that are certified for use with ISO 13849. Can you imagine getting inspected because your safety subsystem cause injury and you explain how you don't use the officially licensed software to program it.

For personal project, that could be fun however.

You completely stripped what I said from its context. GP explicitely said they donate to ReactOS in the hopes of one day being able to run that industrial software on it instead of on Windows. In this context, running the software on ReactOS instead of official Windows would already fail your hypothetical inspections. This is why I suggested trying the LLM route.