Cold rolled shafting is pretty soft.
I'm not sure how you would calculate the area of contact of balls with a shaft, but no matter how many you have, the area of contact is still near zero. This automatically creates high pressure contact and the hard balls will very quickly roll a groove into the soft material. This creates unwanted play.
A true raceway needs to be contoured to fit the ball.
I'd be interested to know if these linear bearings are packed with an undersize ball every other ball. This would improve ball flow and reduce skidding of one ball locking against the other because of simultaneous contact with the inner and outer raceway and the ball in front of it.
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