Most startups fail.
Most startups fail.
Oh that's right about -10X
My experience is that startups are extremely stingy with equity. I honestly was shocked back when I first learned how little equity was given to engineers in general. So I disagree with your statement that it would be useless advice, if you also extend it to giving more meaningful equity to employees. Also, I've had salary offers from startups that matched offers from the big software giants. Startups have money they just have to decide how to allocate it. If they need engineers and they are having trouble hiring, they probably will have to offer a higher salary or lower their talent expectations. Or just keep the same plan and hope to get lucky.
Nobody said that you need to match Facebook and Google. First, it's not like the BigCorps will hire every single person that your startup is interested in (e.g. Facebook rejected Brian Acton who went on to cofound Whatsapp). Also, there are plenty of people who would rather work for (say).9x at your startup than work for x at BigCorp.