I think it has been fairly apparent since the release of the quest after which Meta started no new projects targeting PC and of course many developers shited their attention to that standalone too.
Do you also mean lack of ports for games intended for Quest? On the bright side Amid Evil VR reported better sales on PC than Quest. PCVR could also benefit from there now finally being PSVR2 to target alongside it.
Luckily there's all the VR mods too, Praydog is a hero.
I don't really notice it because my queue is still so full of things to play. I'm half way through Half-Life 2 Mod and whenever I finish that (probably months from now) I'll probably start on Vertigo 2. With the depth of PCVR games you don't need nearly so many releases to keep you occupied!
Everything's been shifting towards standalone. The Pico library is about on par with Quest now too.
Although now that PSVR is here we may see more games crossing over to Steam.