Coming fresh of another private beta I'm looking a bit worried on some of the meta posts over here. For starters I'll quote what has also been pinned in our chat, what Robert Cartaino the director of community development for SE posted after releasing the recent Internet of Things private beta into the wild.
[...] There's no need to force "rules discussions" where there is no actual problem. Folks are more than willing to point out problems where they show up in actual practice, so tackle the problems when/if they become prominent in actual use [...]
In that spirit I'll reiterate myself from chat with all the stars and pins, Let our definition of literature grow meta decision by meta decision and not force it into one giant post about what constitutes literature. (Link)
Now looking at this meta, by any normal meta consensus we made operas in general just on-topic. I'm explicitly not taking any stance on the issue there, but we have no idea what operas are on-topic even means. The comments under the answer make it clear, without any actual question on operas we have simply no idea. I could now ask a question on the beat of the drums in a certain stanza of some opera and point to meta where a question shows a great agreement for operas being on-topic. I could also ask about the choice of hair color for one of the actors, since operas are on-topic. Operas are by far not the only topic that seem to be tackled without any question on the main site.
Long story short.
We have a month before anyone will even edit the help center. We have at the absolut minimum 90 days of beta, looking at recent betas more likely years until we need to finish our scope. And every active member from other sites will know, the scope is never truly finished.
So let's not try to solve everything in the first week and please, let's not define any scope without at least one question on the main site that falls into that category.