Michael Richardson wrote:
The major *security* advantage of IPv6 is that it removes 90% of
complexity of IPv4 networks that results from layers of NAT, and then
series of port-forwards through them.
See page 13 of the slide of Gont stating:
Ironically, NAT66 is one of the most frequently-asked
IPv6 features
As effective address space enhancement by port restricted IP
keeps the end to end transparency for IPsec, there is no
reason to have IPv6 only for the 10 times more complexity
of mixed IPv4/6 networks connected by legacy NAT.
Masataka Ohta
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