I think it depends on what they're doing. If they're doing animation (which includes moving elements in live-action footage) and mostly checking the quality of

I think it depends on what they're doing. If they're doing animation (which includes moving elements in live-action footage) and mostly checking the quality of motion, they might get away with proxy renders. But anyone doing critical color or compositing I would think need to do local renders on a calibrated system, and then commit the work to a remote render farm for consistency and accessibility by other team members.