Then for people who are struggling & can’t afford to produce one “high value” child they make a logical choice to do it later when they have more resources. Since humans are complicated they can create other values they see are more valuable then children or decide to do something later until having children is no longer a possibility.

In your language, we would expect people in the first sentence to revert to K type parents. If they do not, they simply fall into the category described by your second sentence.