You can do all kinds of things with RTX when it comes to reflections, etc.
Now this suffers from all the issues of running it on a 25 year old engine geometry wise and I'm just reusing assets from Quake 2 - none of the textures, etc. are created for this scene - but there are so many different reflection, etc. options:
(I'm just messing about here so the lighting doesn't make much sense, the mirror I've set to resemble something closer to a glossy glass front TV, and with a low framerate on my 1070 there are some noise issues that don't exist on a 2000 series GPU).
With high polygon count meshes, etc. (view it at 40% scale or so it gives some idea) that would blow any current game out the water visually and it will run at 60+FPS 1080p on a 2080ti and with the right media assets and more artistic ability than I have it can easily do any of those example scenes your posted in real time.