There are several uses, but regular strenuous outdoor leisure activities aren't really among them.
Breathable gear only goes so far - there comes a point when the best gear you can afford will result in getting very sweaty. This point is a function of temperature, humidity, price and activity level. If you're consistently going to pass that point, non breathable gear is cheaper (much cheaper in the long term as membranes degrade) and still keeps the wind off.
They're often used by those working outdoors doing fairly light duties, such as directing traffic or otherwise mainly standing. These are often high visibility. More strenuous outdoor workers may well use heavy duty poorly breathable versions.
They can be kept in a vehicle as emergency wear to keep in case of breaking down or worse. These may never be worn so it's not worth investing in something expensive. They also seem more waterproof than at least cheap breathables if you're actually sitting or kneeling in water fixing something. A similar use is car camping, when you may need to go out in the rain to tighten ropes or pegs, but would avoid going out in the rain otherwise.
In the UK climate, and many other places, it's often worth carrying rain gear for even fairly gentle walks that take you more than a few minutes from shelter. You'll be a lot drier and warmer in cheap waterproofs than none at all, which is why compact ones are widely sold in national park shops etc. (I keep a pair in the van that were an emergency purchase in such a shop)