Having access to fine-grained usage and health information for each device in their fleet can help IT managers decide which devices are sent to which users, as well as when maintenance is scheduled
Based only my own experience in large enterprises, the usual process is to EOL new laptops after about three years, regardless of condition. There's a whole sandwich of business and financial agreements built around this, so this 'fine-grained data' doesn't seem very useful (or necessary).
If HP really wanted to make an environmental impact, why not start an HP recycling/refurbishment program?