All I can say is:
MAKE UP YOUR OWN MINDS
Throughout my long career I rarely let weather stop me. I lost two weeks in the winter of 86/87 when I lived on the Isle of Sheppey and we had drifts up to 12 feet deep.
When the snow started to melt, we still had some weeks with ice on the ground but I managed to work. I even put plastic bags on my feet inside my boots to keep them warm and dry.
I was all trad then, of course, but with a bit of care and common sense I managed to keep on top of my work and keep the money coming in.
You need to think more carefully before tackling a job, like wedging the ladder into places where it can't slip, etc but it's perfectly feasible if you know what you're doing and don't take unnecessary risks.
WFP is a different matter - I'm not sure I would want to be splashing all that water about especially near public paths etc.