That's not necessarily a problem with nat; anybody with basic networking knowledge can tell you that packets that move through v4 and V6 do not have to follow the same routes. Since there are more users using v4 than V6 it's common for v4 routes to be congested while V6 routes are not.
That's scaremongering and simply false. Cgnat servers are not necessarily congested. I've been to several isps with cgnat and none of them suffered from congestion.
On a more personal note, if ipv6 were so great, their fans wouldn't have to make up things to badmouth ipv4.
But those frameworks force you to do things the way they want you to. As soon as you need to deviate a little bit, and very often you'll have to, you'll have to rewrite the entire thing.
It was chest-thumping. Mark basically moved the goalposts so he could claim victory. The future he had originally envisioned will never come to fruition.
“Twitter is such as mess — it’s as if they drove a clown car into a gold mine and fell in.” - Mark Zuckerberg