this post was submitted on 24 Sep 2024
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Iv6 doesn't try to simplify routing and remove nat. that's just how things work. Nat is a workaround for ipv4.
Ipv6 is around since 1998. that's not slow to adopt, at that point it is just plain refusal from some because of the costs you mentionend
Ipv6 does simplify routing. It has less headers and therefore less overheard. IPv6 addressed the necessity of NAT by adding an obscene amount of possible IPs. Removing the necessity of NAT also simplifies routing as it's less that the router has to do.
Ipv6 as a concept was drafted in the 90s. It didn't start actually being seriously used until ~2006/7ish.
There are other benefits of NAT, besides address range. Putting devices behind a NAT is hugely beneficial for privacy and security.
NAT is not a security feature. Your firewall blocks incoming traffic, not NAT. It introduces new complexity that now needs to be solved.
In corpo environments you have to struggle with NAT traversal for VoIP communication.
In home networks "smart" devices attempt to solve it with shit like uPnP and suddenly you get bigger holes in your network security than before. You could find countless home network printers on shodan because of this. Even though (or maybe because) they were "behind" NAT.