You wouldn't need to rely on it though? You'll still depend on Fire and Tier III spells as your best refreshers. Actually, the current best stack refresher is a Firestarter which is a random proc so why would TC be unreliable? Specially when Sharping Thunder tends to be a bigger damage gain.
Scathe refreshing would solve no problem, unless you go Astral Fire with full MP by getting the perfect MP tick you can't even Scathe without trading it for a Fire IV. By itself this would change nothing, if this happens and MP ticks issues are fixed or gone entirely it would be good. Actually, fixing MP ticks related problems would make Scathe already useful even without refreshing stacks.
