will save vs mind-affecting effects

[messy]

isn't this phrase a little redundant? after all, has anyone ever made a will save vs an effect that didn't affect the mind?

for example, the unbreakable's 2nd level ability.

[Brigg]

Will saves are also used to resist Channeled Energy. That's not Mind-affecting.

[voideternal]

You have a point that most Will-saves are mind-affecting, but if you look close enough at all the effects that cause Will saves, you will find many that are not mind-affecting.

Here are a few:
Slow
Bestow Curse
Holy Smite

[Snowblind]

There are quite a few spells that allow will saves but aren't mind affecting

Glitterdust is a big one.

So is slow.

[Trimalchio]

resisting intelligent weapons is an unnamed will save.