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.
IPv6 has temporary IPs for privacy reasons. NAT is NOT a firewall. Setting up a real firewall is more secure and gives you more control without things like UPNP and NAT-PMP.