I'm pretty naive about this stuff, but IMO IPv6 is a lot more empowering than v4. You aren't dependent on some owner of v4 addresses for access, you don't need to manage--and aren't forced into--NAT, and you (probably) get to use all of your ports.
My conspiracy theories about why v6 hasn't taken off are: people make money off v4 leases, and email spam blacklists become pretty useless in v6. But again, very naive here.
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