This is true. Just look at Fords decision to go with an aluminum bed on their F150. Going with a material that is more expensive and less durable on their best selling vehicle that’s also a work truck is a big deal, but worth it given the weight savings.
Disagree. Car and truck makers try to optimize for grams and saving a kg of production vehicle is considered a huge engineering victory. Saving 100s of kg is a gigantic deal.