The point being, if I started a new company tomorrow, I would, without a doubt, go and try to hire some of those same people to help me start it. And maybe now, as a more capable manager than I was then, maybe some would make it longer, or maybe some would realize as the company goes from 10 to 100, that they are just much more satisfied at really early stages. Maybe we'd even define their comp and equity to reflect the fact that they might not be on board for the long haul, but might be key for the early innings.
The same thing is true for hiring bigger company people too early... without structure and process, some folks go crazy too and have to leave. You need the right people at the right time. This is hard to do. I messed up a bunch of times. Some people grow with the company through stages, and some don't. I think it's a responsibility of the company to help people grow if they want, or to end the misery and let them go back to what they love if they don't want to change.
Finally -- For what it's worth, people are fired all the time ( as I have been ) for all kinds of reasons, and so it's not a reason not to hire someone. Professional hiring managers know this.