This is a perfect example of the problem the guy you're responding to is talking about. You are correct, but nobody chooses databases by count-of-good-use-case

This is a perfect example of the problem the guy you're responding to is talking about. You are correct, but nobody chooses databases by count-of-good-use-cases. You choose databases by applicability against the use cases you have in front of you and are likely to have in front of you.