I have this.

TP-Link AC750

https://a.co/d/esxrRA4

When you are some place with a captive network and want to use devices that don’t have a browser. You connect the router to the WiFi network that has internet access and you connect the other WiFi network to a device with a browser like your phone. Every device looks like one device to the captive network and you can use them all.

Second use case, I now live in a place with a shared internet access that is shared between all of the units. Anyone can broadcast to and control our Roku device and there is no way to block it from the Roku.

We create a private network with the router

One is actually usable wifi at hotels with ethernet cables available. I don't use that device, but a DIY version that also acts as a portable media server while traveling. We can tunnel back to our home network, but often stay places with very bad reception and or internet access. Also helps keep the kids entertained on longer road trips. They can connect their devices to the router as we travel and have full access to the cached media.