Yup, agree that in some cases this fixes it. Indeed, in another comment[1] on this comment branch I said "Not everyone works at Google and builds all binaries from scratch from a monorepo every time".

So you're only trying to solve compile time issues (incremental and not)? Maybe the right long term solution is C++ modules, instead? And maybe "just" a matter of having your build environment support modules?

[1] https://news.ycombinator.com/item?id=49034842