Not sure why this was downvoted. It's true that ccache and build parallelization (e.g. icecream) can grease the wheels enough that builds are no longer a dev cycle bottleneck.

What the article is about, though, is changing the source code so that it is intrinsically faster to compile. At some point you say "this program isn't complicated, why does it take so long to compile?" Then you start looking at unnecessary includes, transitive includes, forward declarations, excessive inlining, etc.