Humans have a distinct advantage over robots in that we have a brain. I know, it's shocking... This means you have more control over your profit target and can manage your losing trades directly on a trading platform, which automated trading systems cannot provide.
Automated trading robots can only execute trades based on scenarios that have been programmed into them, whereas humans who trade manually can consider everything that is going on, including market conditions, and process it all at once.
Humans are capable of taking into account fundamentals that occur unexpectedly (like Trump being busy on Twitter slamming poor Jinping again).
Manual Forex trading allows you to experience the true feel and thrill of the Forex market.
Human variables influence supply and demand, which most computers cannot analyze or predict.
When humans notice that the market is moving too slowly or too erratically, they enter trades.
Humans have the ability to decide when they have met their profit targets and when they believe the momentum will continue in their favor.
Humans can use qualitative factors to assess current market conditions and make sound trading decisions.
Finally, experience, knowledge, and intuition will ALWAYS outperform computation logic. Most traders have more control over their trading decisions, profit levels, and finding trading opportunities when using a manual strategy.