You mention PC for the exclusives that are there, but even for games that aren't exclusive, it's still always going to be the choice of many gamers to buy a lot of games for a specific kind of experience on a console as opposed to putting together the kind of high end PC it would usually take to run them the way that an Xbox One X will. You think hundreds of thousands, even millions aren't actively choosing Xbox instead of PC or PS4 each and every single time a major game comes out? It happens with every major release. So a game coming to PS4 or PC is not an automatic "haha, it doesn't matter! PC and PS4 got it too!"
$499 makes it a tougher sell, sure, but people who may want the experience they would get on a console like Xbox One X, also see the way third party games run on the system as a major selling point, just like PS4 owners similarly saw the way third party titles ran on PS4 as compared to Xbox One as a major selling point.
I'm all for telling it like it is and acknowledging where Microsoft needs to do better on more exclusive games to their plaform, but how about we stop trying so hard to downplay the very simple fact that all kinds of major upcoming releases, such as Red Dead Redemption 2, COD WW2, Anthem, Metro Exodus, Assassin's Creed Origins, Destiny 2, Star Wars Battlefront II, Project Cars 2, not to many already released games that will be enhanced for the new system, and many other upcoming titles I'm probably forgetting, will clearly run better on Xbox One X. It doesn't mean they won't look or play great on PS4 Pro, but those games will not be better on any other console for the foreseeable future not named Xbox One X. Just as I was plenty happy and satisfied to play many titles on Xbox One instead of PS4 despite knowing full well the PS4 version ran or looked better in many instances, I'm certain the same approach will translate to the current situation now that Xbox has the more capable hardware. Big exclusive titles to make your platform more desirable are important and a huge advantage for any videogame platform, but so too is the fact all the highest selling games out there will run best on a particular system.