I think it would be more accurate to write "Companies are at their most vulnerable when cash is short and they're not generating enough of it to support their operations and growth."
When you play Build A Business With Someone Else's Money and your execution (or lack thereof) leaves you in position where you need more money from Someone Else, you can lament the fact that Someone Else has significantly more leverage than you or you can acknowledge that this was a possible outcome of the risk you decided to take.