The busier the person, the more this holds true because they simply don't have the time to properly devote to buying and owning individual stocks.
Most people get into individual stocks for the wrong reasons.
That's the reason I see most people try it and fail. Don't take me wrong. I have clients who own individual stocks and they can be great. Mutual Funds are a much better choice for most people due to the reduced risk offered by diversification, internal professional management. Investing in individual stocks, you have little to NO diversification, NO management except you and many variables which you have no control over.