My goodness, I thought that was at least a 3rd level spell. Who on earth thought that spell was a good idea?
Of which the Cavalier already gets bonus feats. I'd agree with that being an issue otherwise.
I'm curious of the precedent that makes it 1/day and not 1/wildshape.
I noted those builds specifically because for both of those builds, it's a dagger that doesn't require/stacks with TWF. I'm not saying that it matters for much of anyone else, but I think those can make good use of it.