It's by design that you need a meta-build system. Ninja build files were not designed to be written by hand, not even ninja itself has hand written ninja files.
My point was that, in the context of Chrome using ninja, the claim that "Ninja is used because it's simple, multiplatform and very fast. The mainstream alternatives offer at most 2 out of 3." is a bit odd considering that the decision doesn't seem to be ninja vs mainstream alternatives but rather ninja+gn(or gyp or whatever else) vs alternatives.
