Trading bots are not very good. Automatic trading bots are only programmed to execute orders such as buy or sell and place Stop Loss exactly as the program formula. Trading bots are also less able to adjust to certain market conditions because basically the way of thinking of trading robots is designed linearly, while at the time of news release the movements move fluctuated and randomly.
Some of this issues can be potentially addressed by quantum computers. Of course not in the next 4-5 years but in more or less foreseeable future.