If I post a question on CS.SE and don't get an answer, is it OK to post the same question on TCS.SE after waiting a week or so? In other words, is cross-posting on CS.SE and TCS.SE OK (rather than migrating) if there is a delay of a week between them?
I'm asking to see if I can clarify the policy, because I am confused.
To be clear: I am not asking about simultaneous cross-posting. I'm asking about cross-posting after a delay of a week, when the question didn't get an answer on the original site. I'm not talking about migrating a question or deleting the original one and posting it on a new site; I'm talking about cross-posting, where the question is open on both CS.SE and TCS.SE.
Here is what I have been able to find:
The standard StackExchange policy is: it is not OK to cross-post the same question on multiple sites. If you post it on one site and after a week or two don't get an answer, you can flag it to ask the moderators to migrate it, but you should not cross-post (not even after a week or two).
Currently, the TCS policy says that it is OK to cross-post on TCS.SE and MathOverflow, if you post on one and don't get an answer even after waiting a week or so (and if you must cross-link the two). However this doesn't say anything about other SE sites other than MathOverflow, so it's not clear if this applies more broadly.
There was a proposal to change that policy to allow simultaneous cross-posting on TCS.SE and MO, but that proposal was marked status-declined (it was rejected).
Source: Changing policy on crossposting
Peter Shor points out that one of the close reasons says
Our site policy prohibits simultaneous crossposting: it duplicates effort and fractures discussion. Crossposting is permitted after a week has passed without a satisfying answer elsewhere. When crossposting please summarize the relevant discussions from other sites in your question and link between the copies in both directions.
This sure sounds like cross-posting after a delay is allowed. On the other hand, when you click on the link to the "site policy", the policy described at the link target actually only mentions MathOverflow, not other SE sites. (I hadn't noticed this previously, because I don't have enough reputation to vote to close.)
CS.SE does not seem to have any special policy about this, and I can't find any discussion of this on Meta.CS.SE. Therefore, I would assume that CS.SE abides by the standard StackExchange policy, by default.
Also, given the standard StackExchange policy and the impact on both sites, I would guess that probably cross-posting on two SE sites should only be allowed if both sites opt into a policy of allowing cross-posting. CS.SE does not seem to have opted to allow cross-posting on CS.SE+TCS.SE, and since I can't find any clear evidence that TCS.SE has, either. (It appears that before adopting the current policy regarding cross-posting on TCS.SE+MO, both TCS.SE and MO were consulted; however, I can't find any evidence of any consultation with CS.SE about cross-posting on CS.SE+TCS.SE.)
My conclusion: It's not clear to me what is allowed. The information on the policy does not seem entirely self-consistent, to my eyes.
So, what is the current policy? Is cross-posting on CS.SE and TCS.SE allowed, if you wait a week?
And if this has not been previously addressed, what should the policy be?