Kevin Davey, an (apparantly) successful algorithmic trader/author claims simple strategy works and will always work. Ernest Chan, another guru in this field, however, says simple quant strategies don't work anymore and machine learning is a must if you want to suceed in trading. He also says (along with Marcos de Prado) that it is impossible to do ML-based system trading on your own; you need a team based approach, since it is so labour intensive work. One of the main motivating factor to strive to be a trader must be for a lot of people, the freedom and independence it entails, the idea that you can be succesful by working on your own. What the latter two guys seem to suggest is demorilizing to some degree. What do you guys think? Can a retail trader succeed in algorithmic trading? Even if I have to use ML, is it really impossible to do ML based trading on my own? Thanks in advance for your replies.