While I also agree that it's a great idea, the challenge is that it's a complex system of hardware components. An error in one component won't necessarily show

While I also agree that it's a great idea, the challenge is that it's a complex system of hardware components. An error in one component won't necessarily show up directly associated with the component generating the error. A simple mem test like the article discussed is a nice test, but what if the comparison tables are corrupted? Then it would falsely claim the memory was bad, when it might be the network interface, hard drive, or bus!