Comment by Fabricio20

Yet almost all websites I visit on the daily still dont support IPv6. Discord, probably the biggest chat platform in the world refuses to use Ipv6 because it bypasses rate limiting and IP bans. I don't think i've ever seen a video game ever support IPv6. Using different scopes (for say, failover/load balancing) doesn't work with Ipv6 because computers are configured to ignore local-scoped addresses when sending packets over Ipv6 so you just get downtime instead of having your router handle a failover. Or pay up for BGP. DHCPv6 might as well not work at all (at least SLAAC was decently easy to setup once you wrangle a full allocation from your ISP).

Besides all of those, you are still most likely going to encounter network slowdowns when you have IPv6 because it's gonna try IPv6 and fail to load the target website since even website that have an AAAA record are usually inaccessible over v6 for some reason. Oh and firewall is a set of separate configurations on v4 and v6 (iptables vs ip6tables, having to reconfigure it on nftables for both, etc..) at least ufw handles it nicely nowadays. I had IPv6 enabled for a month about three months ago and all I experienced was slowdowns (due to websites having to fall back to v4) and things not working (such as my failover setup - global scope vs local scope). It's back to disabled in my home network.