Many people in this world are always questioning this, what is a good business? Well, good business is a business that begins, rather than being questioned because the hard thing in doing business is to walk to the first ladder. If we do not start a single step, we will never get to the top. Just as with trading, or investing in cryptocurrency, without trying and starting investing in it, you will not know how much profit you get, and how much experience you will receive if the market is down. Remember that experience is the best teacher.
I understand where you are coming from in the sense that if you want to start a business then you need to just begin instead of continuously stewing on it and never beginning in the first place. However, I think in life we are suppose to question everything so that we truly understand why we believe something to be the way that it is. It's how we continue to grow and adapt to be better individuals and therefore better inventors and so forth.