What we're hearing from you

I can't see how it could be impossible to do. The program can detect the middle click because it already does something different on middle-click - open in new background tab rather than the open in current tab of left click. I've read that at least with Google Chrome an extension can't do it the way one did in Firefox before Mozilla made it built in behaviour in Quantum, because extensions don't have access to WHICH button was pressed. But actually in the main program ... if Microsoft can't make that small kind of additional functionality, there's no reason for anyone to use chromium Edge over Google Chrome.

In fact, if Microsoft added the functionality to the Chromium base, there's a fair number of Google Chrome users who've been screaming fat Google or this for years who would be grateful to Microsoft.