As its name says, 'staff', it is not a coincidence, it is a limiting factor.
There are plenty of spell lists that don't relate/involve the title of the spell list exactly. Hell, some lists have spells that seem to have almost opposite effects of their title.
I think it would be in error to use the title as the final, or even significant rule in a lists effects...
To me... the priority in interpreting spells is:
1. GM.
2. Any special notes at the bottom of the list regarding the spells.
3. The spell's description
...
...
..
...
114. The spell list's title
However I do also agree this is a powerful list... and it's effects should be balanced...
As pointed out, the huge danger to a weapon is breakage, which could leave a caster really hurting. Also pointed out, the fact that weapons could be taken away while walking sticks could make it past the guards (who are protecting the cursed king of Gondor)..
Another possible issue could be the weapon being permanently taken away, be it by theft, incarceration, or other means. (this is also a danger of a staff though)....
Finally, another nice balancing factor could be the suggested special materials required...
All factored in, it could really make a caster think twice about unsheathing their sword, and risking being useless for (I can't quite recall the list's specifics) like 6 weeks, + whatever time it took to find replacement materials and build a new sword.