Do I use that window app store to configure my router or internet connection? How about if you have a corporate account and log in through a connector like okta, which display a web page for login? How about when firefox and half your os gets infected and deleted by your av -will a windows install disk bring back your browser so you can download firefox again?
Being able to show a webpage is an essential function of all modern operating systems. the included browser is a part of windows, much like notepad and vi, or a package manager (programs control panel in windows), or regedit. You are free to add a browser of your choice. The one that's part of the base os image is not your choice, and is supported by the os vendor, as part of the os. You want an os interface to let you frankenstein your os with custom parts and make it unsupported? You have one. You, as an advanced user, can remove edge with powershell very easily.