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I’m a network engineer and I run ipv6 natively in all of our datacenters. There are even a handful of end systems that have ipv6 native networking stacks with ipv4 sockets for our non-ipv6 compatible applications. IPv6 issues are basically self-inflicted at this point by companies that see their IT systems as cost centers, or by basilisk directors who’s knowledge stopped in the 90’s.
Energy density has been the number one most important factor since humans started using metal. Wood is good enough to smelt bronze, and with some refinement can get your iron, but not good enough for steel. Steel requires coal, and with some refinement steel is what our world is built on.
Fossil fuels allow cars, planes and more efficient trains and boats. Unless we somehow start utilizing uranium and transuranics electric airplanes are for grifters. Uranium and it’s derivatives are the only thing we have harnessed that even approaches the energy density of fossil fuels.