[ppml] IPv6 flawed?

On 31-aug-2007, at 17:30, David Conrad wrote:

> I'm beginning to believe that IPv6 as it exists is so flawed and the
> business/economic/political factors are such that in the end, the
> only real hope

[...]

What are those flaws, exactly?

Please omit the ones that are either relatively trivial so they're  
not worth condemning the entire protocol, and also the ones that are  
fundamental to IP as it exists in general and would be so ambitious  
to fix that we can't reasonably expect to do so successfully within a  
reasonable timeframe.