I think the question you linked regarding "What were the Jews expecting..." is reasonably on that edge between Christian teachings and the teachings of Judaism.
The question is really about the birth of Christianity. In other words, what did "Jews-following-Jesus" believe versus "Jews-who-didn't-believe" and where, exactly, did they disagree and split? It's exactly that moment where Jewish and Christian doctrine last overlap then diverge. I see that as perfectly on topic.
In a much broader sense, if the question was strictly asking about Jewish teachings — with no reasonable connection to the subject of "Christianity" — I would probably close it. As a site tightly scoped around the subject of Christianity, it's out of scope to start taking about matters of purely Jewish teachings, unless it has a reasonable connection to what you discuss here.
When it comes to Jewish (or any other religion's) teaching, there may be a strong correlation of what you happen to have extra-curricular knowledge of, but that's is entirely different than what is on topic for this site.