That only splits dependency-build from app-build. Any change to the app source code still causes a full rebuild, unless you figure out how to share the cache di

That only splits dependency-build from app-build. Any change to the app source code still causes a full rebuild, unless you figure out how to share the cache directory between builds (and then parallelism gets sketchy). Generic CI just simply can't parallelize+cache on a level comparable to systems that understand the build itself (Bazel, sccache, etc).