There's EVERYTHING wrong with IPv6. It's a recursively bad protocol. From the basic header design (extension headers, wtf) to the "human management" layer ("why should we deploy IPv6 if it actively _breaks_ stuff?").
As an example, try to design a standards-compliant IPv6 network where you can reliably print from an Android phone if your Internet connection goes down and the router withdraws the prefix. It's trivial with IPv4 and _impossible_ with IPv6.
Sweet summer child...
There's EVERYTHING wrong with IPv6. It's a recursively bad protocol. From the basic header design (extension headers, wtf) to the "human management" layer ("why should we deploy IPv6 if it actively _breaks_ stuff?").
As an example, try to design a standards-compliant IPv6 network where you can reliably print from an Android phone if your Internet connection goes down and the router withdraws the prefix. It's trivial with IPv4 and _impossible_ with IPv6.