I guess I was fairly called out there.
Regarding the specific question in place (which had a good reception from the community), It does ask a rather technical question, but it provided no context to the question. Why would spacecraft a design refrain from using computers? As an engineer in modern times there are quite a few specific situations in which an operator is indeed better than an automated process. But these are fading into past with the rise of autonomous cars and other embedded technology advancements. I'm not sure if OP shares this view, which is indeed opinion based.
Regarding WorldBuilding, the question placed is really interesting, even if the answers are not going to be used by engineers. And you know what kind of place these ideas are very much welcome? Science fiction. And WorldBuilding Stack Exchange is the place for that. It is indeed meant for writers, but anyone can participate. And many questions there place similar challenges: How could this and that be achieved, with X and Y kind or technology being unavailable. And great answers appear there.
As for cross-posting, there may be no need to cross-post the question, it received good attention on SpaceExploration. If OP is dissatisfied with the answers, then another question could be posted on WorldBuilding. I would suggest adding a mention and a link to the SE question and preferably some more details such as explaining why computers are not to be allowed, and what kind of scenario is being envisaged (are we talking 1920 rockets made just after the first airplanes? Are we thinking about a Fallout scenario where semiconductors are not available?). Note however, that in WB one should not really expect very technically correct answers, but rather very convincing answers as readers in general are always assumed to comply with Suspension of Disbelief at least up some level.
As for feature request, you may not have a profile on other SE sites, so it would be weird to have an answer in one site moved to another you never entered. Also, the question itself may have very different requirements in each site. For instance, in StackOverflow it may generally be considered noise to state that a question is homework, but in MathOverflow it may be seen as good practice to state it (though posting homework questions is usually controversial). So maybe it's best to simply link the related question and adapt it to the specific site requirements.