I think you might not have all the information:
Productivity apps: Vision Pro-native Microsoft Office apps were announced day one.
iPad and iPhone apps: It runs them. All of them. Unless the app developer specifically opted out (Netflix, YouTube, Dropbox are the few that did). There's a way to make an iPad app a native Vision Pro app, adding a few affordances like infinite screen aspect, but compatible iPad apps run quite well out of the box.
Steam VR games: Runs 'em via ALVR (game hosted on PC).
Being a 96" virtual screen for an MMO on my Windows gaming machine: check, via Sunlight (server) and Moonshine (app). 90 fps, 3 ms latency.
Porn: Web browsers.
Keyboard and trackpad are supported.
Cost in adjusted dollars: Half of the original Macintosh. (Seriously, we're spoiled by cheap computers)
Will I be called a fanboi? Most certainly, but I own one, use it every day, productively, so I speak from experience. It's not perfect, but I don't think it's as dismal as people think. I compare it to the original Macintosh, which started out limited and was originally a bit of a niche product.
I will admit the product was rushed to launch, has rough edges, and is most definitely in early days, but you gotta start somewhere, and I'm glad that Apple, as usual, started with something a cut above.