It's all hypothetical, as I said. Right now the problem is too much birth control. I only intend to give a counterexample, one which has manifest itself in many places.
This isn't necessarily a defense of the birth control pill. Dangerously fast population growth can also be controlled by changes in family formation - later marriage for women being the most effective.
Remember, these methods were used in Europe when it was 100% Christian. That's why Europe suffered less starvation than Asia, which didn't limit family size as much.
What is ‘just enough birth control’? There’d be guidelines from the creator in the bible. But there are not. So there’s nothing hypothetical. Just wrong