Jobs/Careers was a mature product which had a fair amount of impact, positive or negative on the way the network has turned out. I wouldn't treat this the same as Documentation, which was a Beta and an attempt to extend the Q&A format in other ways.
Even as a defunct product, there may be value in keeping documentation of it around for the future - as a matter of being a record of the history of the network and its various components.
While it's tempting to focus on moving things to the outpile of meta, I'd argue that the effort spent might be better spent elsewhere.
Someone misattributed once "Thou Shalt not Kill, yet not need to strive officiously to keep alive". If one comes across such a post organically - voting to close or getting it retagged is fine. It's probably not a good use of time (and risks flooding the front page) to concertedly close or 'fix' these.