> Run one wireguard server in your home and one client instance on this router and now all of your devices can share the same residential VPN connection.

You don't need a "travel router" for this. My phone is permanently connected to my server via Wireguard (so that I can access my files from anywhere). Adding another device just requires adding a peer in the server's config file and can be accomplished very quickly. It's not clear what problem the travel router solves, unless perhaps you travel with dozens of devices.

> no million suspicious login detected from all your social accounts,

I can personally do without those.

I can accomplish this via one access point instead of configuring wireguard on N*5 family devices.