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And that's exactly the problem - a web developer's or security auditor's "shell injection" is a system administrator's "this language sucks".
These wrappers are the kind of thing you want for shell invocations when using Python as a replacement for a shell script or rewriting something that was originally written in Perl, but they're a terrible idea if anything you're interpolating came from an untrusted data source.
Currently, requiring "shell=True" in the arguments to the subprocess calls is considered a sufficient deterrent against people doing the wrong thing. I'm suggesting that requiring "import shutil" instead of "import subprocess" may be a similarly acceptable compromise that better serves the system administrators that choose to use Python for system automation tasks.