two vs three brake circuits; hydraulic vs hydraulically/electricallyactuated brake calipers

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What I do not get is this: what prevents the automakers from putting
electrically actuated brakes in the rear and retain hydraulics in
front?
Is that the fear of electrical failure throwing a wrench into the
leftfront&rightrear, rightfront&leftrear duo that is in business of
providing
redundancy now or is it the feel of the handbrake lever in an
electrical system servicing the rear wheels that is an issue?

From the cost perspective it seems a bit cheaper in production to not
run hydraulic lines all the way back
to the rear wheel calipers. Heck: for all i care fuji could put the
prius style regenerative anchors in the rear and noone
would notice given how much weight bias to the front a typical car
has. Besides, such a setup would seem easier to flush, no?

 

[1 Lucky Texan]

http://finance.yahoo.com/news/Toyota-recalling-15-million-apf-6238391...

What I do not get is this: what prevents the automakers from putting
electrically actuated brakes in the rear and retain hydraulics in
front?
Is that the fear of electrical failure throwing a wrench into the
leftfront&rightrear, rightfront&leftrear duo that is in business of
providing
redundancy now or is it the feel of the handbrake lever in an
electrical system servicing the rear wheels that is an issue?

From the cost perspective it seems a bit cheaper in production to not
run hydraulic lines all the way back
to the rear wheel calipers. Heck: for all i care fuji could put the
prius style regenerative anchors in the rear and noone
would notice given how much weight bias to the front a typical car
has. Besides, such a setup would seem easier to flush, no?

I'm not sure what you're intending to suggest, but, approx. 70% of
braking occurs at the front wheels so, they should get whichever
system is 'most reliable'.(debatable, I know)