Yikes: had I known my comment would be used as a "call to arms", I would've chosen my words more carefully. To expand:
- Lore is technically not off-topic here.
- There are some "bad"1 lore questions that get asked here that many of us don't like and wish were asked somewhere else.
- I personally think SciFi.SE is a good place for that.
I don't think Arqade should be the ones to funnel lore questions we don't like to SciFi, either through some sort of policy2 and/or through an Arqade-originated advertising campaign: besides the fact that it's discouraged to pass the buck like that, there are many here who don't think all that highly of SciFi.SE and probably wouldn't want to see us do any sort of heavy promotion for it or make it a rule to funnel people to it.
Rather, the intent behind my comment was to get one or two of the "SciFi ad on SciFi" submissions posted in our Community Promotion Ads thread, much like Chess.SE has done, to get the word out that Arqade doesn't have to be the only place you think of when you want to ask why something only has four claws.
Note 1: "bad" in the sense that they don't really help you do better in a game except in the abstract sense
Note 2: unless the Arqade community decides that all lore is off-topic, which doesn't seem to be likely any time in the near future