[ptom]

OP here; motion sickness doesn't really apply to the productivity setup, since nothing's in motion (physically or visually). Good tracking and high framerates take care of most motion sickness for room-scale activities - those in which your physical and virtual motions are well aligned. But experiences which simulation motion are still likely to induce nausea unless you get your "VR legs".

As for the FB devices - available audience and cost of doing business. They also support the Vive Focus 3 now though, and others are in the works.