The weakest link is usually the investor or trader himself. Investing is making decisions. Trading is making decisions even more frequently.
Since it is only known afterwards whether a decision is correct, trading requires dealing with uncertainty in the right way. The mindset is essential to achieving success. Many investors have difficulty accepting a loss and therefore often wait too long to take a loss.
The power of the computer is precisely that it knows no emotion. A good strategy therefore becomes effective. Moreover, it is possible for a computer to take advantage of opportunities 24 hours a day. We want to make optimum use of that power.