the signal can't be 100% profitable, but in this case the signal can give us preparation before we jump into that position. By analyzing the pattern of coin movement in a daily, weekly, month or year time, we can determine the signal for the coin. so signal combined with manual analysis is better than anything
Signals can also give you wrong indications sometimes.
If you are in the middle of a trend, sometimes you see the signal shows that the uptrend is likely to continue and you buy, but the signal turns out as false and you regret buying at the wrong time.
When btc was $250, I did not buy it waiting for the 'right time' but it never came. I always made excuses to myself that not today, but tomorrow I will buy at this price but it did not happen. Even today, if btc touches $70k then it will be high over 10%, so should I not regret? Times are always right, we need to time it well and keep patience.