https://arstechnica.com/gaming/2023/04/half-life-alyx-is-now...
https://arstechnica.com/gaming/2023/04/half-life-alyx-is-now...
It's mainly because of the restrictions of different mediums, for example Alyx has much less enemy density, very narrow corridor-based levels made for limited movement of real human bodies and environments, a lot more emphasis on interactivity with the world and objects that would lose their meaning if replaced with "press F to $WHATEVER" buttons. It might be pretty mediocre as a flat-screen game.
I guess it may still be worth it if you desperately need something Half Life and want to see the story, though for that I'd rather watch it on YouTube, or just rent a VR headset for a month.
I played in VR and it was an all encompassing experience, still the best VR game I have played. I had even been playing VR games for a few years before trying Alyx, and it still blew me away, in a way that other VR games had not yet. That level of graphical fidelity and immersion is simply not in any other game. Which means it's a skill issue for VR studios, not a hardware issue (in my humble opinion)