Well let's see if I can stretch my metaphor to address your points. :)

Equipment needs to be maintained to continue working at peak efficiency. Sometimes it needs to be taken offline for repairs or routine maintenance. Or maybe you realize you need to switch over an assembly line to build a different product or model more important to your bottom line.

So, yes, there are times when the software manufacturing equipment will not be manufacturing software. But you want to keep that time to a minimum and understand the cost to the business of having the equipment offline.