If you genuinely believe that the gap between the PS4 and the PS4 Pro is subtle enough to mean that games on the Pro are merely 'PS4 games in high res', but the gap between the PS4 Pro and Scorpio is so enormous to mean that it will match up to high end contemporary PC games, I feel sorry for you. Mark my words, the differences will be subtle and iterative, because that's all the specs will allow for especially when you remember that games developed for Scorpio will necessarily be built for feature parity with the Xbox One. Expecting a larger gap than exists between the PS4 and the Xbox One is naive. If you consider that to be a chasm, then fine, but I think most people know it's a fairly subtle difference in most games. The most likely thing is for Scorpio's power to be used to push 4K, verse the Pro utilising tricks like checkerboard rendering to hit that resolution. This isn't just going to be a subtle difference, it's going to be a difference most people don't even have the right screens to see.
Either way, Microsoft should not be planning on countering actual games with hardware.