While I appreciate the "code review should be improved" it is fairly easy to accidentally import something you should not have in many IDEs (the merge the class

While I appreciate the "code review should be improved" it is fairly easy to accidentally import something you should not have in many IDEs (the merge the class path) as well as other accidents. These issues along with many others including code formatting can be automated. Separate projects allow less namespace collision accidents. You could achieve all of this with monorepo but requires proper tooling.