In California many repair items will fall in the category of emissions. When i looked into it a saw that emission items are covered for 10 or more years and 150k, i felt better about not getting the ext. Warranty. In reality the ew will be trumped by the emissions warranty on much of the electric system and wasnt worred as much about the ice components.
That warranty for California, and maybe other ZEV states, is a big deal. I think some items have 15 year coverage, and this only applies to PHEV vehicles, not BEV or hybrid. Perhaps another reason GM didn't see a reason to continue a vehicle that would have to be covered for up to 15 years.