I'm interested, apart from the chicken egg problem, what are things that you found bad about IPv6. What do you think is overengineered? I personally found that

I'm interested, apart from the chicken egg problem, what are things that you found bad about IPv6. What do you think is overengineered? I personally found that the features I interacted with were useful (SLAAC, address size, router advertisements, ...) and the changes made it cleaner (removal of broadcast for multicast, removal of fragmentation fields, ...).