Comment by thisislife2

In my opinion, you only need this if you don't like connecting to unknown (insecure or suspect) network to get access to the internet. Ideally, you would configure this kind of router to connect to a VPN so that as soon as it connects to the internet, it immediately logins to the VPN and reroutes all your network traffic through it. This makes it more difficult for someone to hijack your connection or crack it. From the comments it also appears that some people use it to connect to their home network, either to access their home server or to use as VPN (this can help you get around geo-fence and unnecessary additional authentications that some services require for fraud prevention). Some travel routers can also combine 2 or more internet connections (public WiFi + mobile data) to provide you a more stable internet connection, which is often desirable.