For people on a temporary visa, I guess exit passport control can make sense. For people holding the country's passport, it just doesn't. As far as that goes,

For people on a temporary visa, I guess exit passport control can make sense. For people holding the country's passport, it just doesn't. As far as that goes, I've had my passport not be stamped plenty of times on leaving countries that _do_ have exit passport control (e.g. France), so the problem you describe is present even there.