DISCLAIMER: Only Fractal knows for sure
I
think you have to save it, which means that there's no fully automated way to update the curves in all your presets at once.
I'm pretty sure that at one point it was said that with this set to Yes, presets where that SIC update happened would appear to be modified, i.e., Save button was enabled. Makes sense, it
has been modified, even if you didn't do it yourself exactly.
However, I haven't seen that happening since the final release came out. Maybe I haven't happened to look at any presets whose SIC was updated, or maybe I missed it, or maybe the final release changed how this part of this works. Bottom line, I'm not sure about this piece.
@FractalAudio @Admin M@ can you clarify?