Microsoft’s One Outlook program aims to rationalize the current client set. The Edge WebView2 component allows Outlook desktop to reuse OWA features, which is why Microsoft now distributes WebView2 with the Microsoft 365 apps for enterprise (desktop apps). We’re now seeing signs of reuse with an obvious example being the appearance of OWA’s room finder in Outlook for Windows.
Microsoft will include the Edge WebView2 runtime with Microsoft 365 apps for enterprise version 2101 or later. This doesn’t mean they install Edge; it’s simply a software component to make it possible for Outlook desktop to run features developed for OWA. You can block the deployment if you like, but there’s really no good reason to do so.