(Note: comparisons to the PS5/PS4/Sony are done for the purpose of providing context and a slightly more detailed response)
Four reasons the Xbox Series X feels off:
1) No 'next-gen' features announced. As corny as it was at the time, the PS4's integration of share features (i.e. Video and screenshot capturing, broadcast to Ustream, Share button) felt like 'next-step in gaming' features. Thus far, Microsoft haven't announced Xbox Series X (terrible terrible name btw) features that feel like the future. This is why Sony are consistently bringing up 3D audio and haptic feedback. While both features have existed elsewhere in some form, they're fresh to the console space and serve as immediate differentiators between current-gen and next-gen. Both features could end up sucking, but both features already make the PS5 feel like it will offer a never-had-before experience. It's really really really important for the new shiny thing to offer something that people haven't experienced before.
2) From a games and franchises perspective, the Xbox One did a measurably horrible job of setting the stage for the Xbox Series X. It's really hard to get excited about the next Xbox when the last one completely shat the bed in terms of games. More teraflops and CPU juice are great, but when the conversation around Xbox games is --after almost two decades of Microsoft being in console gaming -- about another Halo, another Forza, and another Fable, it's just really really hard to look forward to the XSX.
3) All of the big features announced for the XSX --virtually no load times, raytracing, cloud streaming, 8K support -- are features that the PS5 has. I think in hindsight, that Wired article was a smarter move than I (and I'm guessing a couple of other people) thought. It seemed like such a non-event to detail the PS5 (and what it was bringing to the table) in boring text. However, what that article really did was establish the aforementioned features as stuff that PlayStation is bringing to the table. The effect of that is even though the XSX has the same features, due to the timing of that article, the XSX comes across like it's copying the PS5. It's difficult to get excited by a seemingly 'me-too' product.
4) Microsoft have, as a result of poor and sagging sales results for their IP, made all of their first-party games non-exclusive. You don't need an Xbox to play Xbox games. The consequence of that decision is that when it's time to sell a new Xbox device, the early-adopters of new consoles (i.e. us) are even less incentivized to go out and get one. On top of that, all of their first-party titles for the next two years will be on the XB1. So the new Xbox 'feels off' because all of its software will be available elsewhere. Frankly, that's a pretty bad space to be in.