Eh, I disagree with this. There may not be a save against Cause Light Wounds, but there is against, Fear, Charm, Hold Person, and pretty much every damage spell going. I don’t think a percentage of total chance is the right way to look at it; you say, “Who cares?” when the Save is 16+, but if your Character makes the Save-versus-Blast-for-half by 1 point and that lets them survive, the bonus made all the difference that matters. There are certain ways where higher level spells versus higher level PCs are more important, seeing as some of the effects are more nasty (e.g. Magic Jar instead of Charm Person), but even at low levels you’re often saving to avoid death. What could be more important? That one or two points from Wisdom could be the difference between making the Save, and rolling up a new character.