These are based on probabilities and there is always going to be a probability of below average temperatures so they can’t just drop that category.
These contingency planners are meant to be for businesses, policy makers and public services. There will be plenty of info and explanations with them. The Met Office aren’t going to just hand them out and say ‘There you go’. They're also just meant to be a guidance, which the Met Office forecasters won't stick rigidly to when discussing them with their clients.
They're not pointless but they shouldn't be publicly available with the way they get misinterpreted.