With load/unload mid course, you could still have one intense side and one more family friendly side.But what would Uni gain from that? The racer is taking two 700m loops to make one more regular sized coaster, if they did that at Epic theyd end up with a 2 and half mile coaster.
From what ive modelled they could actually make one track non-inverting and have a more accessible to younger rides with a slightly lower height restriction as one of the two tracks was slightly more tame than the other. That way they could serve a larger audience.
As far as to why Universal might want to do it would be if the theme of the coaster somehow ties into the day/night cycle. Night becomes day, day becomes night kind of thing.
I don't really see much difference in building one 2.5 mile coaster and building two 1.25 mile coasters. It's the same amount of track.