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You might want to say a word or two about why PostScript isn't gated by the sniff-scriptable flag, even though it is most certainly scripted. In fact, it looks like GhostScript doesn't even default to -dSAFER (the flag that turns off the "read/write/rename/delete any file" and "run any command" facilities) yet, though gv(1) does.
Hmm... PostScript has been marked as Safe since before I inherited the spec, so I just carried it through. I have no background on why it was marked as such, and your comment suggests that perhaps it should not be.
https://github.com/whatwg/mimesniff/issues/100