You can use the Quest as a PC HMD, both wired and wireless. So no, it's not a problem of performance.
The reason the Quest can't secure content is the content doesn't sell. Which is the same reason Sony struggles to secure content. They both basically have to finance the entire library. Sony and Valve sidestep this by having VR be a feature in flatscreen games, but even then people arent' queuing up to get them.
And nobody wants to use VR as a monitor, either. Maybe in a plane if you're a weirdo or to watch movies in private if you live in cramped quarters, but nobody is going to get to their desk and slap on a face-screen to type a text document, no matter how fancy and expensive it is.