Ron Griess of of The Chart Store directs our attention to this particular chart (below).
If you want to know why indicators using any form of advance/decline data do not work as well as they used to in the past, perhaps this chart might provide some clues.
Please use the comments to demonstrate your own ignorance, unfamiliarity with empirical data and lack of respect for scientific knowledge. Be sure to create straw men and argue against things I have neither said nor implied. If you could repeat previously discredited memes or steer the conversation into irrelevant, off topic discussions, it would be appreciated. Lastly, kindly forgo all civility in your discourse . . . you are, after all, anonymous.