If you are using a stretch-prone tarp, such as silnylon, having elastic, self-tensioning side-tie-outs will mitigate some of the RL tension issues. The stitches in the ridgeline (if present) help to minimize the stretching.
BUT, you are correct: making adjustments (if necessary) in a rough storm is made easier with the DutchWare Stingerz or Tarp Flyz. Much easier to handle than Prusiks or similar knotted techniques*.
*Not that I'm against knots, far from it! But I must admit that the hardware option here is preferred.