You need NAT whenever you can't change your peers' routing table, for whatever reason.
It's used extensively in IPv4 world for LAN=>WAN connectivity because your only peer (your ISP) won't agree to send all traffic for 192.168.0.0/24 to your home.
Its most popular use case disappearing doesn't make it any less useful for the narrow set of circumstances when it's basically your only option.
It's used extensively in IPv4 world for LAN=>WAN connectivity because your only peer (your ISP) won't agree to send all traffic for 192.168.0.0/24 to your home.
Its most popular use case disappearing doesn't make it any less useful for the narrow set of circumstances when it's basically your only option.