What the PowerShell is trying to be is more of a Lisp descendant, something to which Unix has been mostly deaf.
"Unixy" invokes very specific concepts; it is not a synonym for "computer sciency", "intellectually agreeable" or "non-sucky in some ways". (Relative to some things, it sometimes is these things, though!)
Dumb character processing is "unixy", and Bash is in fact "dead unixy".