The question “why” inherently requires reasoning as a response, though. If the answer had been, “DQs used to only serve ice cream, but the founder wanted to…” blah blah blah, that would be an answer.
Doesn’t answer ‘why,’ though. ‘Why’ is asking for the reason it changed from only ice cream to ice cream and food.
You didn’t ask if DQ had changed from ice cream only to ice cream and food. You knew the answer to that. You were asking for the reason they made the change.
Why can just mean explain something that is unexpected. Which you did with the history lesson. It doesn’t have to answer causality.
The question “why” inherently requires reasoning as a response, though. If the answer had been, “DQs used to only serve ice cream, but the founder wanted to…” blah blah blah, that would be an answer.
I disagree with your premise.
Why?
It didn’t used to be, but that’s how it is now.
Doesn’t answer ‘why,’ though. ‘Why’ is asking for the reason it changed from only ice cream to ice cream and food.
You didn’t ask if DQ had changed from ice cream only to ice cream and food. You knew the answer to that. You were asking for the reason they made the change.
I didn’t know that they used to not sell food. All I know is that I didn’t expect them to sell food.