NAT traversal happens automatically in most home and office networks. Relay servers kick in only for truly stubborn CGNAT and firewall combinations.
Each connection uses a modern Noise Protocol handshake with keys that rotate automatically. You never touch a config file.
One coordination server gives every device the same private IP, regardless of OS or cloud provider. No subnet juggling.
Define who can reach what in a single ACL file. Changes propagate to every node in under a second — no switch reboots, no ticket queues.