Actually, it's not outdated, but it is the technology being used to make a router as a repeater or as a WiFi range extender. WEP ill ensure more bandwidth. Setting a router as a wireless extender and repeater is old technology, and rarely used nowadays, yet it isn't outdated, or being phased out, as it's still being used.
If you're upgrading to a faster, stronger wireless router, don't chuck your older Wi-Fi box. With the magic of DD-WRT, you can turn your older wireless router into a range-expanding Wi-Fi repeater How do I enable the extender mode feature on my Nighthawk Jun 08, 2020 How To Set Up a Router As a Repeater - Expert Hoot May 11, 2020
By installing the free DD-WRT firmware on a router, you can turn it into a wireless repeater or bridge. This means that even devices that can't reach your main router wirelessly connect through
Can't Log In To Repeater Settings Page (How To Find Change the repeater IP address to the address belonging to the same subnet your router uses before you configure the range extending feature. Let us take an example. Let us say you are eager to set up your repeater to extend the router signal. You find out the IP address of the router. Perhaps, it is 192.168.0.1. How to Use a Router as a Repeater to Extend your Wi-Fi Dec 10, 2019
A wireless repeater receives existing wireless signals and re-broadcasts them, increasing the range of your wireless network. This doesn’t require a wired connection to the router, but offers worse performance. An access point is simply a second router offering wireless access to the network. This requires a wired connection to the primary router but offers better performance.
A WiFi Repeater effectively contains two wireless routers, similar to the wireless router you already have in your home or office. One of these wireless routers picks up the existing WiFi network. It then transfers the signal to the other wireless router, which transmits the boosted signal.