That is because the rift is dated hardware. WMR, Vive Pro, Pimax and such have a considerably higher resolution already. Of course, it requires high end GPUs to really use (in particular with Pimax 5k) so we're a few years away from it being both good enough and affordable, but the hardware is already here.
Agreed. I would even call WMR and Pimax affordable. They are about the same price as a graphics card that can run them (250 bucks), so they are in line with the rest of the gaming hardware. Vive Pro is ridiculous, though.