> And by that analogy, the previous BIOS version was released in 1981, and modern networking is hamstrung by its design which assumed "4 billion addresses ought to be enough for anybody" and that it needed to be manageable by an 8-bit OS with 64KB of RAM.

I'm not sure if it makes the analogy better or worse, but this is what happened; BIOS was born in ~1981 (I think), had severe shortcomings that were partially mitigated over time but you can only mitigate so much, UEFI is a better replacement, BIOS->UEFI was a somewhat rocky migration, that migration was made worse by extra stuff getting bundled in (secure boot), and this led to a significant chunk of the population deliberately avoiding it at least for a while. The only real difference is that UEFI has long since become standard, while IPv6 is still fighting for adoption.