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Yes, you may be right for your situation. I do not happen to have any system available with PCIe slots in it but would love to toy with a bunch of Parallella boards for a CPU-bound thing or two. So for me this is a more interesting option and I've backed their Kickstarter for that reason.
Our OS who art in CPU, UNIX be thy name. Thy programs run, thy syscalls done, In kernel as it is in user!