What I see are more technological affordances for closed firmware behavior of the device, increasing complexity, and providing additional opportunity for, and cover for, secret surveillance, backdoors, and other malware.
The used laptop market is very healthy already, and sellers already make money doing their own n-point tests before selling. Some use turn-key diagnostics software packages that work with the state of the laptop as it is (and drive SMART data). It's worked fine, AFAIK.
I've personally bought and used ~40 used laptops, mostly from random sellers on eBay, and not knowing the laptop's dating history hasn't been a barrier. The only significant, rare problems have been dirt and strange odors, which presumably aren't sensed and recorded in this "telemetry".