I think I asked this same question when I was a noob. Sometimes you just have to try something to see the merits.
I went ahead, bought some Zing-it 1.75 and 2.2 mm, and made a continuous ridgeline. Of course, I was afraid to go with 1.75 mm for the ridgeline because I had read that the soft shackle prusiks wouldn't grip unless the prusiks were a smaller diameter than the rope to which it is attached. So my first ridgeline was 2.2 mm Zing-It with Nite Ize Knotbone attached via locked brummel on one end, Nite Ize Figure 9 prusik'd onto the ridgeline on the other end, with 1.75 mm Zing-It soft shackle prusiks to attach tarp to continuous ridgeline. It's so easy to center the tarp between trees and over the hammock this way.
Nowadays I use titanium Dutch hook attached to the ridgeline with a locked brummel on one end, ti Dutch Tarp Flyz on the other. I now use 1.75 mm Zing-It for everything - I just wrap the prusiks four times instead of three.
Try it - you'll like it!