Well in the videos Hambini makes the point that most drag is due to seals. Some bearings have full contact seals, which make contact with the bearing races, and some have noncontact seals. The contact seals are better for keeping crap from getting inside the bearing so are more durable; noncontact create less drag so spin more feely. BBINFINITE’s thing seems to be low drag so I guess they use noncontact seals. Other brands are available in noncontact as well.
I have BBInfinite bearings in one of my bikes. I think their adhesive keeps the bearings from shifting around and hells reduce drag also.