>>313993225
>Why
Because components that small would be hard to fuck around with, currently they're soldered together as all small electronics are. PC cases usually have a ton of space to maneuver around and for parts of varying sizes to fit. Like >>313993505 said some level of modularity might be possible, but customising the base hardware will never be a thing imo. Even laptops offer very little customisation.
>Why
Because you block light. It's not a matter of tech, a headset will never be able to see something that it's cameras don't have line of sight on. Base stations let you get way more angles on your environment so you can track the controllers basically no matter where they are.