We want to have an indication to which exactly die given protocol instance is referring to (in example in multi socket/multi PCH designs).
Have you considered to use data fields such as "CONST CHAR8 * DieName, Stepping, Sku" instead of the methods?
Yes, but there might be a configuration where chipset id is going to be changed during the boot. By using methods, we ensure that returned value is correct in every call.
Regards,
Maciej