This so much. And an excellent corollary to this is that when you have lucky 100% uptime there is no incentive to optimize mean time to recovery. Sure the ras

This so much. And an excellent corollary to this is that when you have lucky 100% uptime there is no incentive to optimize mean time to recovery. Sure the raspberry pi in your closet has been running fine for years, 100% uptime, but then a component fails. Do you have a replacement on hand? Are you continuously monitoring it to know it went down? The component failed at 3am, did it page you? Did you hop right out of bed to rush to fix it? Single systems can have really nice uptime until they don’t. Then you are hoping that the people on hand can repair what’s going on after months or years of never having to do that. Mean time to recovery might be a week while you wait for new hardware or a few hours while you google some error message you’ve never encountered. People can run their own systems if they want to, but they shouldn’t confuse good luck with rigorous engineering.