I fully agree with HRedot that there is value to making sure that existing customers as well as potential new customers are offered the opportunity to convince themselves using the default asset list or a personally compiled asset list going even further back in history about the viability of the strategy across at least one or a more complete economic cycle.
As a matter of fact, the zorro founders persistenly stress the importance of backtesting over a sufficiently large period. It is against their own advice to not offer the opportunity to backtest before 2009 on the Z strategies. This is indeed a bit disappointing and certainly raises suspicion for those with a critical mind.
On top of it all, it would be relatively straightforward to implement a slider that allows the user to adjust the total length of the testing period. The fact that this hasn't been done indeed suggests that the period prior to 2009 suffers from a bigger drawdown. What is the point in hiding this and trying to embellish a strategy?
