Maybe they are lacking in get-home-itis? Only assumption that can be made is that the crew/aircraft combination is not certified, or company rules prohibit CATII at ORK - I cant think why though!
Honestly, the slightest hit of cloud and WW get skittish. Its ridiculous. At least twice on flights I've been on we have been told there is a good chance of ending up in SNN. Weather conditions at the time have been quite good, even RE getting in.
I'll put it like this, if I needed to be somewhere important at a certain time, I don't think I'd book WW. Too unreliable. Shame really, because almost all of the crews are really quite nice.