Bumping things to 25kWh vs 10 kWh and sure that can last the lifetime of the vehicle, but it also means replacing 1 EV with ~3 plug in hybrids vs 8 that the original poster mentioned. And you now have to manufacture and maintain 3 ICE powertrains which further cuts into the savings.

Plug in hybrids can be a great option for many drivers, but IMO they they essentially inherit the downsides of both EV’s and ICE. For example they have issues sitting unused for long periods. Need to replace belts and spark plugs etc. They risk both a battery fire and gasoline fire etc etc.