Unlike with aio, adev only links top-level @angular/ packages to their npm archives from HEAD. Transitive dependencies are not properly updated, like we do for AIO— this means that adev may run with older versions of the Angular compiler because e.g. the CLI devkit would have their own transitive dependency.

This can cause subtle build issues when making changes in the compiler. We should investigate if this is still needed, but not throw away the effort put into AIO:

Additional context: 6cc3256