I don't use a continuous ridgeline...just tie to the tie-outs. Never saw a need for one. Tarps are usually strong enough to withstand pretty strong gusts...my MacCat has been thru ~100mph winds in Yosemite and held up fine. One of the ridgeline cords broke...which is what I want, b/c I can repair a snapped line with a square knot, but if the line is stronger than the fabric and causes the tarp to tear...that's not so easy to repair in the field.
I still use that MacCat.
If I'm not sure about the rain, I can hang it up inside the skins and get the same benefit of quick deployment as if it were over a continuous ridgeline.
Just different strokes for different folks.