> What confuses me is why anyone would switch from Linux to Windows if they do anything where Linux had the upper hand?

Makes as much sense as switching to OS X. The Mac OS is not Linux.

If you're developing for Linux, or using something like GHC where the OS X version is a least-favorite stepchild, or if you need package management as capable as APT or the FreeBSD Ports Collection – then if you aren't running Linux as your desktop OS, you're most likely running it in a VM, regardless of whether your host OS is OS X or Windows. In fact the author explicitly says he's doing as much.

So "somewhat but not quite like Linux" isn't something the author would strictly need to look for in his host OS. Intead he can take other factors into account, such as reliability, performance, available applications, and hardware choice, quality, and cost.