I've used a lot of PSP over the years. It's designed to rapidly turn an unprepared surface into an operating surface for aircraft, and to enable rapid repairs of an airfield. It's useful for putting over soft or unstable surfaces when walking, too.
If you have other choices, use them. PSP was never designed to be the ideal surface. It's an only choice in areas where rapid construction has required it's employment, and landing on it is no option. In other words, it's great when you've got nothing else. It's not so great if you have any other choice.