The premise is to have enough assets to support your investment and be able to continue to buy at the right time. What's more, it's your emotions. Investors' emotions control the choices of investors. This is a factor that helps us succeed, and it is also one of the factors that ruin us. These accumulated experience will make good judgments for future investment. Knowledge is necessary. It is not a qualified investor to enter without doing homework without understanding the unknown field.
And here's your own theory. I don't deny it either, but I find it takes more to make a good investor. Between theory and practice with investment, and it brings experience and will be experienced in the field you pursue. A good investor also depends on each individual's feelings, and to me the process and results they create is the best answer to whether they can do it.