Worldbuilding, according to most, should not be a What If? site.
However, an increasing number of questions are phrased in a "what if" way, and it's not always easy to discern if they're on-topic (building a fictional world) or what-if (asking what would happen) which is off-topic.
Many questions do not seem to be phrased as "in this world", but rather, "if there were a world". Instead of "in my world," it's often "pretend there were a world where..."
Does this constitute What-If? Are these questions on-topic?
- Most effective method of creating fear? "Let's say a psichotic alien race..."
- ... What features would humans gain or lose? "Let's say humans lived in caves..."
- Can a split personality itself have split personalities? "Let's say a person has..."
- Time required for isolated colonists to forget about their origin "Let's say that I have..."
And a notable variant to discuss is "let's call"