What's up with these new rotors?

Can't do that.
I need the new race that came with the new bearing in there.
I have the time and patience for a mountain if that's what I need to do to be sure of my mole hill quality.:D

I would agree with @YY1 normally, but it isn't 30 years ago when we could count on manufacturers and suppliers to not throw the cheapest parts into things just so their prices can be a little lower than the next place.
Why?
What going to be the big difference if you use the new race that's currently in the rotor, and the new bearing that your talking about?
Never going to notice anything detrimental with the bearings being packed with grease.