they simply don't have enough snow clearing equipment.
Not true, at least when I was involved. You have to remember to clear a runway of snow you actually have to close it, dodging aeroplanes with snow brushes isn't really possible. And if you have prolonged snowfall, and we did several times recently, then at best you can only just keep the brushes and ploughs going at it so that when it stops snowing you can then have a concerted effort to clear it.