The first part is basically any android device, now you know why!
>These updates depend on many device-specific non-Google hardware and software providers that work with Google to provide the highest level of security and stability support,”
What an utter BS!! How hard it would be for google to have an agreement with these vendors to support it for say 10years?! Also, I don’t think you would need such an agreement as mostly new software updates will be compatible with the new hardware unless major changes were made like a cpu architecture etc., you can still get an intel pentium cpu working fine with linux/windows, a fully functional OSes not a browser based one!!