"It needs killer apps" I think is a reasonable request if you're someone who's been super into VR and has already played much of the Quest's library on other devices. Like, I think that Superhot VR's best version is the Quest one just due to the degree of mobility you have versus a tethered solution, but that doesn't necessarily mean I'd tell you to rebuy it for Quest if you'd already played it on another headset. And hey, maybe you have your cable suspended from the ceiling and a pretty big play space, in which case the difference between your setup and Quest is smaller.
But if the Quest is your first headset, or even if you already own a VR headset but haven't gotten a lot of use out of it because the area in front of your PC/PS4 isn't that large, or because you're worried about cables, or whatever, then I'd say there are already at least two obvious killer apps (Superhot VR and Beat Saber), and arguably more based on taste.