In the days when I used AIQ, their CCI @ 100 setting was superb. When I switched to Sierra, I found there was a difference in the algorithms between the two, used to calculate CCI. Since then I have never been convinced about the action on CCI. As you point out, SOMETIMES it works well. That infers that sometimes it doesn't.This I agree with. As time changes , the market changes and I discover new things, other things get left behind, like CCI. It's what I am comfortable with but it should not influence others in their quest to find something that they can work with. It may be that chosing a different setting for CCI may work wonders for someone else. I found that at 150 it was as close as I could get to CCI @100 on AIQ. This process of discovery cannot be done by just looking at today's 10 min chart. One has to build up a picture over a long time. RSI and ES Vol divergence proide me with everything I need and want out of a system, for most of the time.
Why do I keep it on my charts? Habit , I suppose, and maybe someone may see something that I don't.....