I think there is a whole lot of variability in this equation. I do try to keep some "cushion" in the bank, but I can borrow if I have to. So if I have drained the savings I can still get by via borrowing for a while if necessary.
I'm fortunate that my employment is very steady. The chances of me losing my job are slim. If it were less steady I'd be better about keeping that cash stashed.
If the unlikely did happen and I lost my job I would pretty quickly have access to a large stash of cash. Which I'd rather save but would spend if it saves my ass from starving and foreclosure.