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.