For server applications, the trends of virtualization and microservices mean that having "machine" dedicated to running a single application is a very common sc

For server applications, the trends of virtualization and microservices mean that having "machine" dedicated to running a single application is a very common scenario, and also for server VMs running a bunch of apps it is not obvious that having a partition per application is an issue, it would be trivial for the VM initialization scripts to automagically configure a dedicated partition for each DB. Having a OS+filesystem running a virtual OS+filesystem running a database has all kinds of redundant caching, and we could systematically skip a layer here.