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
Like you said, it can't help make absolute profit..
And at the moment, what you need to rely on signals a lot to choose, and I do not.
There is so much accumulated about knowledge that we keep talking too much about it, it's just a limitation in the very thought of ideas to develop.
Easier example: I buy bitcoin when it drops to $4000 and buy again when it crosses $2000 ATH.