There are a lot of practical reasons to set up an OS like Windows 10 in a VM rather than using it as a native installation. If you have to deal with files you can't trust, need to test multiple OS ...

VMware’s polished and pricey desktop virtualization platform adds formal support for Windows 10 and a host of minor enhancements Think of VMware Workstation 12 as VMware Workstation 11, Service Pack 1 ...