Isn't modern Edge chromium based? I'd understand using Edge back when it was using it's own technology, as much as I hate Microsoft internet browsers, it allowed for optimisations such as better battery life on laptops. But using chromium based Edge, I don't understand it at all. Who wants to use Microsoft flavoured chrome? Yuck.
I think the "upsell" (Lord help me for calling it this) is that it integrates with Office365, or in a corporate environment, AD. So by provisioning it once you have every component interconnected. If you're used to Edge at home you will not be hesitant to want to use it at work. To say nothing about getting non-corporate home users into Bing and, ideally, Microsoft's OpenAI-ified Bing.
They had to switch to chromium because web devs like myself just didn't take the extra time to make a second set of style definitions to work with their stupid engine. Firefox still has some issues here and there with inconsistent styles but it's not that bad. Edge used to just be a nightmare for style compatibility. So I would just put up a notice saying edge wasn't supported and save myself the trouble.