LOL...I just checked out the part of TOM that describes Truenaming magic items, and I'm beginning to think the entire chapter was written under protest.

Scrolls, staves, and wands are created to target a specific truename. This means that a scroll might be crafted to work against Zbavra the Witch-Queen, or a beneficial wand might have Tordek as the target. The scroll targeting Zbavra might prove worthless if the Truespeak check failed to encompass her CR. Tordek might become so powerful that the wand no longer can affect him
Right there in the book, they tell you that Truenaming "might be worthless". That is just precious.