Even though Microsoft has sunset Explorer, it is still available in Windows 11 (hidden). Many older programs rely on the old Trident (HTML-) Engine from IE, even stuff as basic as the old Control Panel. Old browsers are old, so unlike modern browsers where the WebView can be its own component, it's either all or nothing. And since the engine is still required not to break Windows functionality and apps from before 2015, it's still included (but mostly hidden). The whole file manager system is still based on IE. That's also why Device Manager and Control Panel are still there too. Similar to Dahua and Hikvision, Microsoft changed the UI and not the core, and added new features to upgrade its OS. A lot of legacy stuff are hidden.
So contrary to popular belief, Internet Explorer isn't going away anytime soon.