Those human scaling problems are also security scaling problems; the Unix process model (and, in fact, the von Neumann architecture) doesn't separate modules in

Those human scaling problems are also security scaling problems; the Unix process model (and, in fact, the von Neumann architecture) doesn't separate modules in security capabilities, nor is it practical to do so. Microservices allow your permissions to be clear and precise. Your database passwords are only loaded into the process that uses them. You can reason about "If there's an RCE in this service, here's what it can do". Trying to tie that to monoliths is hard and ugly.