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@Greenbank
In dry conditions maybe, but with all of that braking force through the front only you'll be near the limit of traction, and you don't want to have the front lose traction when nearly all of the weight is on it.
In damp/wet conditions front-only braking will mean you lose traction and lowside well before the rear is completely unloaded; that means braking with the rear is relevant.
In an emergency you don't want to be thinking "is the ground dry or damp? Should I use 100% front or a bit less of front and use the rear? Why am I thinking about these questions and not applying any brakes yet?". You just want to be doing what you've been taught to do instinctively - hence front and rear.
This is why they teach you (on motorbike training at least) to use ~75% front and ~25% rear. I'm sure dj can advise on what the current cycle training idea is.