[AdamHeard]

The key difference between bushings and bearings is cost as everyone has said, and then efficiency.

Efficiency might matter for your design, it might not, it depends on what motors you're using to steer.

We had two globes steering 4 modules on bushings, and it worked fine; with such an overpowered system we actually ADDED friction to help tune the control loops.

If we were trying to do a crab steered by window motors, I'm unsure what we'd do, I imagine bushings would still work depending on your reduction.