From what I hear, the XR screen has the same pixel density and resolution as the 6/6S/7/8 iPhones. So you know what the screen would look like, but you would also get 1.4” more screen real estate. Yes, the XR also lacks 3D Touch, TouchID, and dual cameras (but the 7 also only has one camera). You would also gain the A12 Bionic chip, portrait mode, Animoji/Memoji, FaceID, a better screen to body ratio, and those fun things.
However, a XS or XS Max will have those benefits with an even better screen to body ratio, dual cameras, 3D Touch, and a better screen. I’d have to watch the videos again to see all the differences, but I think those are the biggest ones.