NAT will still be possible - just not necessary for conserving address space.
But... imagine trying to get your call-center staff to ask the customer to read back their local IPv6 address so you can troubleshoot. That's going to be bad enough.
Then consider there may be proxies in the way, intentionally or otherwise, so you probably want to know the IP address the customer is hitting your product with, not their computer.
Most of us on HN are probably smart enough to find out our own IPs a half dozen ways - it's the 3rd party support that's tougher.
NAT will still be possible - just not necessary for conserving address space.
But... imagine trying to get your call-center staff to ask the customer to read back their local IPv6 address so you can troubleshoot. That's going to be bad enough. Then consider there may be proxies in the way, intentionally or otherwise, so you probably want to know the IP address the customer is hitting your product with, not their computer.
Most of us on HN are probably smart enough to find out our own IPs a half dozen ways - it's the 3rd party support that's tougher.