Alyx is a bit of an edge case because they needed a VR showcase, and it's unlikely that a PC VR game (even a Valve one) could have sustained a healthy multiplayer population. Regardless of the reasons why it happened, it's the one and only singleplayer title they've released in the last 14 years, which neatly aligns with them discovering the joy of lootboxes 15 years ago.
To say Alyx was just an "VR demo" is pretty sad and reductive. Even today it's the one of the best VR games to be released in both fidelity and performance and as VR tech continues to improve its truly aged like fine wine