Then how are we going to tag fujiwara no mokou's talismans? If you're going to say, "those are ofuda," no, they are not, not according to the definition provided in ofuda's wiki, nor are they ever described as ofuda on the Touhou wiki.
Ofuda is definitely being used too liberally for the definition danbooru is using, which isn't even the full proper definition.
Ofuda should imply talisman, for sure. There's no reason to nuke talisman, ofuda are not the only kinds of talismans, they're not even the only kinds of paper talismans.
Edit: Expanding on this, despite its very strict wiki, ofuda is basically being used for any paper talisman, regardless of origin. Jiangshi are commonly tagged with it, but the Jiangshi sealing talisman is Taoist in origin, and has little, if anything, to do with Shinto.
If they are so visually similar, having specific tags for each kind will just cause rampant misstating. Have to evaluate the need for a specific talismans tags.
We could call them all talismans and that would be it.
For all intents and purposes on Danbooru,ofuda is the de-facto talisman made up of a paper strip and writing. It's a simple enough solution that ensures it gets a tagged.
I am now more leaning to just aliasing Ofuda to talisman but I know people will screech for it.
I think if we're not gonna use a japanese term correctly, we really shouldn't be using it at all. If we're going to just use ofuda to mean any paper talisman, then we should either alias it to talisman or rename it paper talisman.