Has anyone actually backtested their EA over 10+ years of data, or are we all just gambling with code?

[ThaddeusFinch]

Everyone claims their EA is profitable long-term, but has anyone actually backtested theirs across multiple market cycles (10+ years)? Or are we just curve-fitting recent data and calling it an edge?!

 

[RolloTape2025]

Answer is yes to the backtesting and no to the 'just curve fitting'. If you are curve fitting it sounds like you are adjusting settings to try make a system work. Which is ok, but also has to be tested out of sample, right?

Second answer is that some things are not easily backtestable but still work.