"... the elimination of the problem of protecting rotating bearings from the highly abrasive lunar regolith."
A legitimate point. But with no atmosphere to hold and carry dust to rotating parts, that should be a small concern, and easily overcome by proper seals.
Not by the Apollo astronauts, for whom it was a problem. They were trying to seal stationary surfaces. I understand some progress has been made, but sealing rotating surfaces is not an easy job.
"... the elimination of the problem of protecting rotating bearings from the highly abrasive lunar regolith."
A legitimate point. But with no atmosphere to hold and carry dust to rotating parts, that should be a small concern, and easily overcome by proper seals.
Not by the Apollo astronauts, for whom it was a problem. They were trying to seal stationary surfaces. I understand some progress has been made, but sealing rotating surfaces is not an easy job.