Someone simplified this to the CEO's job at less than 20 people is to say "Yes" with more than 20 people say "No". His idea was at the start you need to make sure that everything get's done and everyone get's paid. AKA, from backups to taxes there are a lot of critical check-boxes to getting off the ground and you need to get all that done while building something that people want AND selling it to them. The worlds on fire and there are far to many critical things that need to be done right now.

But, somewhere around 20 people you should have some excess time and money and choosing what not to do becomes just as important as what to do. Let's not do this manually, let's not build this in house, let's not piss off our customers, let's not stagnate, etc. At scale the minefield grows exponentially and it's not getting stuff done that's the core problem it's getting the right things done while not wasting resources.

Remember hiring people is easy, having them be a net gain is the hard part.