Parts & Service documentation means more than software
The nerds can always reverse engineer practical controls. As a systems integrator, your job is providing access to comprehensive service information and long-term, easy access to parts. This is harder than it seems because of the necessary infrastructure and product management control. (Engineers are always tweaking something)
Of course, then you have to withstand the inevitable liability risk and lawsuits from idiots improperly installing capital goods in their homes. Let's be honest, there are people out there struggling to fasten their airplane lap belt...
The technology is NOT the hard part, it's all in the distribution and support
I would make sure your systems focus more on self-diagnostics, data logging, and anything else that makes troubleshooting faster and easier