I'm rather annoyed your acting as a purity commissar in a hardware recommendation thread and you didn't bother to familiarize yourself with the thing your nay-saying. If your going to drop a its not FOSS purity bomb - you should know why!
I'm not a purity commissar and I actually don't agree with the "proprietary software should be impossible to install" thing of FSF. I meant that what runs on the stock Linux kernel may not run on libre kernel and it can't be a benchmark of FOSS support. Also I'm not talking about VMs
Qubes is a framework around XEN, the microkernel to share and isolate hardware resouces amongst VMs. Inside of those VMs you can run whatever operating system/kernel you like.
Qubes is about as FOSS as you can practically get.