It's a mindset about for thinking about your own finances. That's it. It's absolutely the wrong tool for thinking about equity grants.
I've always considered illiquid equity lottery tickets. Yes, playing the lottery is stupid because the expected value is so small. At the same time, I am absolutely buying into the company lottery pool, and want to maximize the number of tickets I get. If it pays off, wonderful. It it doesn't, whatever, because I never counted on the money to begin with.
Like I said, I just think it's a poor name for that mindset. If what you mean is "Count on your equity being worth $0", say that, and not "Value your equity at $0".
Maybe this has to do with the contexts I've heard it in, but my gut is that it too often deters people from thinking more critically about their equity and whether they're being treated fairly. If someone new to startups read just the comment I originally replied to and not any of this follow-up, would they have understood what you're trying to say?
I've always considered illiquid equity lottery tickets. Yes, playing the lottery is stupid because the expected value is so small. At the same time, I am absolutely buying into the company lottery pool, and want to maximize the number of tickets I get. If it pays off, wonderful. It it doesn't, whatever, because I never counted on the money to begin with.