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.

As long as you are sitting or moving naturally, motion sickness is pretty much solved for most people. Refresh rate and tracking are good enough these days.

Where motion sickness is not solves is with artificial locomotion, e.g. using to use the joysticks to move around like in a regular FPS game, that will still make most people motion sick to varying degrees, but many will get used to it after a while.

I think motion sickness in VR is a bit like taking LSD. Set and setting is all I can think about when I hear people's stories unless they are particularly bad.