[thrownaway2424]

Yes, Blaze and a hojillion computers will give you a spiffy build system. The public now has the former, but not the latter :)

[skj]

One piece at a time! Also, who is to say that Google's way of orchestrating those hojillion computers is best? Separating the two pieces, as has been done here, makes it possible for others to create different (and maybe better) orchestrations.