The main problem with all black box timing systems is subscribers need to take all backtested results with a grain of salt. Subscribers don't know if and how much curve fitting was used to "manufacture" those amazing results.
A second problem with black box timing systems is that the most recent 5-10 years since the timing system was launched has the highest degree of backtesting. If the market conditions change like they did for Timing Cube after the high volatility ended (2004-2006), subscribers need to watch for system failures. TimingCube, IntelliTimer, and countless others began failing miserably. That is a good sign that their creators curve fitted their systems to meet the current situation. IntelliTimer was failing so miserably that they completely switched from an IT system to a ST system. When these systems start failing the lies and hidden truths begin from their creators. What really needs to happen is that these failed systems just need to shut down and stop spreading lies.