Given the very long list of proposed extension sites for Stack Exchange, and the ongoing process to incorporate (a substantial subset of) them into the Stack Exchange family, I would counter-suggest that all circumstances as described in the OP are only temporarily out of scope for Stack Exchange. Perhaps a We-Haven't-Categorized-This-Scope site is needed, to hold these questions and answers until a more specific site is open for business.

To address a point raised below:

I am trying to suggest that rather than deleting such questions and answers, they be moved to a miscellaneous site. If the purpose of Stack Exchange is to be a first point of reference for interesting questions about the current state of human knowledge, are there any questiosn and answers that are truly out of scope for Stack Exchange as a whole?

Given the very long list of proposed extension sites for Stack Exchange, and the ongoing process to incorporate (a substantial subset of) them into the Stack Exchange family, I would counter-suggest that all circumstances as described in the OP are only temporarily out of scope for Stack Exchange. Perhaps a We-Haven't-Categorized-This-Scope site is needed, to hold these questions and answers until a more specific site is open for business.

To address points raised below:

I am trying to suggest that rather than deleting such questions and answers, they be moved to a miscellaneous site. If the purpose of Stack Exchange is to be a first point of reference for interesting questions about the current state of human knowledge, are there any questiosn and answers that are truly out of scope for Stack Exchange as a whole?

Note that I am not suggesting to replace the waste bin with a publicly visible site. Rather that useful questions and answers, found on a site but deemed by that site as being out-of-scope, be relocated instead of deleted. I believe this presents a friendlier face to Stack Exchange as a whole, and serves to preserve positive contributions made by questioner, answerer, and commentators alike.

Given the very long list of proposed extension sites for Stack Exchange, and the ongoing process to incorporate (a substantial subset of) them into the Stack Exchange family, I would counter-suggest that all circumstances as described in the OP are only temporarily out of scope for Stack Exchange. Perhaps a We-Haven't-Categorized-This-Scope site is needed, to hold these questions and answers until a more specific site is open for business.

Given the very long list of proposed extension sites for Stack Exchange, and the ongoing process to incorporate (a substantial subset of) them into the Stack Exchange family, I would counter-suggest that all circumstances as described in the OP are only temporarily out of scope for Stack Exchange. Perhaps a We-Haven't-Categorized-This-Scope site is needed, to hold these questions and answers until a more specific site is open for business.

To address a point raised below:

I am trying to suggest that rather than deleting such questions and answers, they be moved to a miscellaneous site. If the purpose of Stack Exchange is to be a first point of reference for interesting questions about the current state of human knowledge, are there any questiosn and answers that are truly out of scope for Stack Exchange as a whole?