ipv8 is a "vibe coded" specification from someone who doesn't understand the problem at all. Just like ipv6, you can't use ipv8 without upgrading the whole internet. The internet is mostly ipv6 capable and not at all ipv8 capable so why do you want to throw away that progress and reset the clock?

It's also just a worse design, centralising a bunch of things and trying to authoritatively define what counts as "a network" on both sides of the communication, unlike v4 and v6 where you just have raw bits and can interpret them how you want. I mean ipv8 defines the internet as a bunch of networks and a network as a bunch of computers. And a network is something that has an ASN. Your computers would be on your ISP's big network, not your small home network because you can't have a network inside a network. It also decreases the number of bits than we already have (in ipv6), limiting futureproofing. It also says every network device will log in with OAuth. Yes, really.