Why is this short opportunity window unique? So you realized you missed this window but then the environment was already one where this "5x" demand no longer existed? If that's the case would it have been wise to ramp up that quickly? Maybe you did the right thing.
Where you’re correct is that people look at this in hindsight and say things like what I said. But in the moment they may think this is the big chance, hire a few staff to build them faster and get stuck with a bunch if liabilities when demand ramps down while they were hoping it would continue going up.
People who don’t believe in their business fail, some never even start. But believing your own hype is the best way to fail spectacularly and I expect it’s hard to see while it’s happening. Even as an employee I’ve looked back a few times and wondered what the hell I was thinking buying into a failed idea.