Interesting question. I have always bought used steel frame road bikes from the 90s and consistently drop people on expensive carbon fiber bikes.

If you aren't optimizing for many other factors already the amount of weight loss from the lighter frame will have a minimal effect.

I never said I am commuting on $5k road bike. I just compared the price of the electric car to price of high end carbon fiber road bike (which I have, but don't use for commuting to work).

I commute on cheap mountain bike. Too many potholes and obstacles, etc for any road bike with 23mm tires. It would get destroyed on first ride to the city core.