Comment by rl3

Good defense is layered.

For vulnerabilities, complexity usually equals surface area. WireGuard was created with simplicity in mind.

>So, the alternatives to ssh you suggest are all reliant on passwords but ssh, in the case, is based on secure keys and no passwords.

WireGuard is key-based. I highly suggest reading its whitepaper:

https://www.wireguard.com/papers/wireguard.pdf