A very good question S'less, one that makes me think that the ability to land in a field makes some of us with a certain mindset, depart in weather conditions below that where if the field landing wasn't an option, they wouldn't have taken off in the first place.
Imho, the rotary ability to land 'in a field' and the thought of using it as a considered option if the met's a little dodgy, is nothing more than an empty chamber in the cylinder of the revolver used in the game known as Met Roulette. Unfortunately either side of that particular chamber are the gotchas!
We can get caught out and the forecasts can be wrong, however on this particular day ….