The only thing you need is traction. Anything else doesn't matter. It seems insane, but investors are blinded by traction. If you are a startup that has low scalability, but you have traction, you will get funding If you are insanely scalable, a great idea, but you don't have traction, you just won't get funding. It doesn't matter how awesome your team is. Investors just can't see good ideas through the traction curt…
You're only saying that because you've never tried raising funding for a company with traction. But except for very rare exceptions, even when you have traction there are a whole new set of questions about the nature of the traction.