You guys are absolutely doing the right thing by combining your Win32 and Xbox development environments and, personally, I am 100% on board with that. It’s not only the right business decision, it’s great for gamers and developers too.
However, you cannot bring the legacy of PC gaming forward into your next-gen hardware and software platform without including a precision input like a trackpad. So many PC games have interfaces designed for a Mouse (& Keyboard), and then there are of course the PC games that are legitimately unplayable without a Mouse like RTS games. I know the vast majority of games nowadays launches with controller support but there are still a large number of existing games that have not and will never get controller support added.
Do the right thing. Add a Trackpad (or 2!). (Also add back buttons… NOT paddles, buttons!)