There are certain points in the Titan Ex fight where I know Miasma will finish only if I really risk a landslide. There are some times I break a ruin while dodging, where if I just had a smidgeon of spell speed, I'd have finished it. Some of the time you really just can't afford to risk the potential for lag on mechanics, but the overall benefit of SS is so minor and subjective that it is hard to quantify, especially when it comes to BiS.
