i don't get why people say that past performance is not a guarantee of future performance - page 2

 

The idea is to show that an EA was able with a specific strategy during a certain period of time to provide a good return.
Potentially this EA win on long trends and loose on bumpy market. If on the last years the market
was trending more than being bumpy you have good results. Potentially in the future, market will
have less trends and the EA will have bad returns. As well some economic factors such as Brexit,
Political elections, wars can make some huge moved on the market and not all EA are able to support
this type of market behavior. And you never know what will be the next big unexpected situation :)

Reason: