re: router config - Windows has Captive Portal support and all routers which require config will intercept dns requests to msftconnecttest.com and redirect to the local IP of the router which Windows will show in a modal window

re: corporate account - The WebBrowser component (MSTML/Trident) will never be removed because it would require replacing a huge part of the OS that handles this, in too many places, and it won't be replaced with WebView based on CrEdge because that has no support for proprietary Microsoft controls.

They will remove IE, but not Trident.