Microsoft is planning to remove WEP encryption from Windows 10.
Since the 1903 release, a warning message has appeared when connecting to Wi-Fi networks secured with WEP or TKIP (which are not as secure as those using WPA2 or WPA3). In a future release, any connection to a Wi-Fi network using these old ciphers will be disallowed. Wi-Fi routers should be updated to use AES ciphers, available with WPA2 or WPA3.
WEP is very old – it entered the scene in 1997 – and was cracked in 2001. It’s incredibly easy to crack, so it only makes sense to remove this outdated feature from Windows.