I don't think that's the main takeaway. IMO, the main takeaway is there are, in the best case (exit for >100% of latest 409a), ~three classes of shareholder in a startup: those with preferred shares (investors, occasionally founders if they have a lot of leverage), those with >=1% fully diluted common shares, and everyone else.
In the most common positive case (i.e. sale price is <100% of invested capital), or negative cases, the three collapses into into preferred holders vs common holders.
If you're in the lower class, you should assume your equity is worth zero. No matter what startup you're joining. You're here for the cash comp and to be surrounded by a growing cast of ambitious, upwardly-mobile people.
If you're in the "middle" class and highly value future wealth over present matters, you should act "like a founder" (sacrificing your life to, one day, make 1s or 10s of millions) if the company is on the ups, and you should act "like a mercenary" (leaving to some place where you can resume acting "like a founder") if the company is permanently plateauing or on the downs.
If you're in the "upper" class it's a different game entirely. That's not really the subject of this thread (valuing equity from a typical prospective employee's POV), so I won't go there.
Whether a "good startup" (great founders, great business, great investors) results in "a meaningful outcome for holders of <1% of common shares" involves so much luck and non-determinism that's beyond your influence as a <1% employee that you would be foolish to write it off to anything other than zero. The same is not true for >=1% and founders, of course, so they should value their equity differently.
Edit: the "magic" that many startups try to get away with is convincing people in class X that they're actually in class X+1 (even X+2!) and that, you should therefore act like it!! Be wary.