Why Physical Relationship Between Unmarried Is Prohibitted?
Unsure what’s the conclusion but I am more in the lines of understanding it as a matter of putting boundaries to uphold the system of a family. As you might have heard from Ghamidi shb and probably discussed above, “Actual limitation of zina comes when you get married, not before, that is only as a precautionary measure and is haraam even before due to that” It clearly gives the impression that once you marry, that is your family and your physical relationship needs be within the bounds. You cannot go freely and have a kid (as a result of your relationship) with someone else out of wedlock because you won’t consider yourself a responsible person for raising that child who was born unwanted. Hence, the relationship needs be within the limits, the results of which you can OWN. Which exactly means all the following responsibility that you mentioned (raising well, educating, feeding etc). Since the common problem is to limit that desire of relationship, only that is being targeted and not the very uncommon thing of not raising children well. It may happen 1400 years ago and may happen now that some parents be negligible towards these duties however, these are still exceptions and even when asked they’d probably own their mistakes. So, the point is the responsibilities that you are talking about are well understood and so is the result of not fulfilling them just like the fard namaz/fast etc is understood and not fulfilling them is committing a sin is well understood but that is nowhere mentioned in Quran because there’s no need to.