Outboard bearing are mainly for weight to keep it spinning. cheap ones just use metal slugs. The center bearing is shielded for low friction. the outboard ones are rubber sealed but they will spin somewhat.
Crazy thing is the bearings are like class 7 or even 9!
which is a huge waste of money. This is a step or two up in precision, and cost, from most metal working machines. I can not even understand how that tolerance is calculated. You are talking run out which most measuring gear can not see much less measure unless you spend hundreds on the micrometer and take all precautions such as, climate control, body heat, vibration etc.
Motors and woodworking machines are maybe class 5 or even class 3. might be better in a router at high rpms.
Bill D.