When you say IPv6 isn't hard, do you mean implementing v6-only network stack isn't hard or understanding IPv6 isn't hard? Depending on which layer one lives on,

When you say IPv6 isn't hard, do you mean implementing v6-only network stack isn't hard or understanding IPv6 isn't hard? Depending on which layer one lives on, I feel like the lack of networking effect makes supporting v6 difficult. Github is still isn't on v6 and some load balancers will prefer the v4 address over v6, etc...