This is a misunderstanding. In IPv4, NAT acted as a crude, non-security barrier. In IPv6's vast M2M world, security moves to the device itself.
The M2M VAST IP transaction follows a linear "handshake" logic: m2m vast ip
Fast forward to today: every smartphone, laptop, smart TV, and car competes for those addresses. M2M—where factories, drones, pipelines, and wearables need direct, persistent connections—broke the IPv4 model. This is a misunderstanding