- I don't want my interfaces to have multiple IP addresses

- I don't want my devices to have public, discoverable IPs

- I like NAT and it works fine

- I don't want to use dynamic DNS just so I have set up a single home server without my ISP rotating my /64 for no reason (and no SLAAC is not an answer because I don't want multiple addresses per interface)

- I don't need an entire /48 for my home network

IPv6 won't help the internet "be addressable." Almost everyone is moving towards centralized services, and almost no one is running home servers. IPv4 is not what is holding this back.

It’s not implemented in the Linux kernel, but the latency penalty you’re describing is part of the “Happy Eyeballs” algorithm: https://en.wikipedia.org/wiki/Happy_Eyeballs

As sad as it makes me to admit, I don't think IPv6 is ever going to happen without government intervention. Adoption is flat at under 50% over the past year. IPv6 doesn't benefit big tech. SNI routing and NAT work pretty well for centralized platforms. AWS will gladly rent us IPv4 addresses until the end of time.

> enjoy if there was a manually induced latency penalty for "legacy IP" that needs to be manually turned off on Linux

That sounds so bad, it probably will be a windows feature.

Why, so you can inflict some personal pain on people without IPv6 access?

Making IPv4 intentionally laggy would break orgs that depend on ancient gear or SaaS with hardwired v4, for a purist's thrill and outages for users.

This reminds me of the ways the governments screw over people to force them to do things they don’t want to.

Please no. I used to have a Dutch ISP a few months ago that did not support IPv6 yet. (Odido. Same ISP that leaked my data in a big hack.)