wgconfig(8) and peer endpoint

[Sad Clouds <cryintothebluesky%gmail.com@localhost>]

Could anyone familiar with WireGuard explain the following lines from
the man page:

--endpoint=ip:port
  Set the peer's endpoint address outside the tunnel.  This is
  optional for a VPN server if the wgconfig interface is
  configured to listen on a port number.

As far as I understand, the client specifies the endpoint as the public
IP address of the server, so that the client can connect to it.

Under what circumstances would it be useful for the server to specify
the client endpoint in its peer configuration? It is supposed to
dynamically determine the IP address in case of mobile clients. Which I
guess would preclude this from happening if a static endpoint is
specified?

Are there any use cases for this option on the server side?

Thanks.