MicrosoftDoH often breaks with captive portals or even some networks that explicitly block it. Will there be an easy way to turn it on or off without having to manually revert the settings?
While having per-adapter DNS settings may be useful, this is far from usable. How about a top level setting in the Network & Internet settings page to enable or disable DNS and to select a known provider or custom servers which get applied across all network connections. It should be as easy and usable as the 1.1.1.1 mobile app and the Android Private DNS Mode setting.
