Last year, they all came crawlin' back to Steam, and this year was another strong one for Valve.
From the opinion piece:
Last year, I pointed out how many big publishers came crawlin' back to Steam after trying their own things: EA, Activision, Microsoft. This year, for the first time ever, two Blizzard games released on Steam: Overwatch and Diablo 4.
This article didn't research the VR bits...Gabe has said multiple times, even recently, that they are working steadily on VR and it's hardware. Their next headset even has a codename, Deckard.
Also, I don't think most people realize Valve doesn't have much of an internal structure. It more resembles a community of people working together because they want to.