I think you grossly underestimate the amount of games, particularly from Japanese publishers/developers, that don't come out on X1. I mean yeah, the X1X is "the most powerful console on the market" and will play stuff like Fallout 4 and all of the FPSs and the 8,000 open-world games that come out from the big publishers every year slightly better than a Pro but most of those are boring trash and the games that people around here mostly give a shit about, it gets next to nothing.
In addition to all of the pretty good games Sony's put out this generation themselves, X1 doesn't have Persona 5, Tetris Effect, Bloodborne, everything VR-related (there are surprisingly several good games/experiences on that front), Darius Burst, most of the JRPGs, most of the fighting games and a bunch of the Japanese developed indie shit.
I don't particularly care about CONSOLE WARZ bullshit but if you've waited this long to buy a "current-gen" console and have been playing nothing but a PS3 the last ten years, there's zero reason to get an X1/X1X. Unless you desperately need a 4K Blu Ray player but those can be had for $100 on Black Friday.