Interesting find!
One of the new Letter options requires Steward 5, which is currently unreachable.
One other point, which might be related. Apparently at Moulin, one of the Statues has two options, one of which requires “Zeefaring” or a name like that. The mouseover text says it’s a new skill which is coming later in the year. So there are some plans for new stats. I also faintly recall someone saying that “skill” was FBG’s internal terminology for Mithridacy, Shapeling Arts, et al. So it sounds to me like we might have a few new ones.
I certainly don’t recall Steward of the Discordance having a cap before this.