defining how to setup IPv6 IPSec on your TV, DVR, Washing Machine, Fridge, etc is not trivial (for that matter, setting it up securely on your full blown computers is not trivial, even for experienced admins)
As long as devices can be shipped and 'just work' without some complicated setup, manufacturers will continue to have that as the default.
Any completely automated IPSec setup process is not going to be any more secure, as the rogue equipment will be able to automate joining the network just like any legitimate equipment.
Now that you have a 'soft center', the only remaining question is if you opt to expose this out to the Internet, or if you try to get some protection by putting a 'hard shell' around it.
and arguments for ubiquitous IPSec or SSL can actually reduce the overall security if they make it impossible for the devices at the edge of the network to protect devices inside the network.
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