There is a book about extreme economies. The author discusses it here: https://www.econtalk.org/richard-davies-on-extreme-economies/
They go through how the mackerel as money came about. Also, that expired mackerel, i.e. fiat, have their own lower exchange rate.
My kids laptop has 4 IIRC. Getting a PC motherboard with more than one on rear and one connector for front of case was impossible last I looked. I generally keep my pc’s for about 5 years and wish to future proof somewhat. It is beyond ridiculous at this point. Although, I haven’t tried to buy one for a few months so perhaps this has changed.
BYD is supposedly bringing them to production.
https://cleantechnica.com/2023/04/22/the-sodium-ion-battery-is-coming-to-production-cars-this-year/
It comes down to having tires sized to carry the weight. A heavy vehicle would need tires the size of those Russian off-road vehicles to match the light Jeep. Also why light offroad vehicles like a Polaris side-by-side are so popular now with people that drive trails. And why you would never want to take those lifted full-sized trucks off road even though they are popular on the highway.
RCS is a terrible standard. But China wants it, so Apple is forced to add it.