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If you grab a handful of front brake on say a damp road, you'll lose the front.
So if the bigger rotor was really a safety issue they wouldn't have them on the front either.
I think their concern was due to fitment issues, not safety.
I reckon a bigger rotor on the rear makes more sense because I'm more likely to use it like a drag brake when it's slippery and that could be where heat becomes an issue.
hippy
@danb
The difference between the force required to skid the front vs rear is massive - hence why you run bigger discs on the front (same on cars and motorbikes), in fact unless its icy or you have shit tyres in the wet then it's pretty much impossible to skid the front wheel on a bike(assuming vaguely sensible weight distribution) - you will lift the rear wheel before it happens.