> where the compilers had a fast mode for code-build-test cycles and a very slow incremental mode for official builds. That already exists with c/c++...unity b

> where the compilers had a fast mode for code-build-test cycles and a very slow incremental mode for official builds. That already exists with c/c++...unity builds aka single translation unit builds. Compiling and linking a ton of object files takes an inordinate amount of time, often the majority of the build time