DDF is a tool. It is no better than a pair of pliers or a screwdriver. In the hands of an amateur it does nothing but sit there. In a skilled mechanic's hands it is a different matter.
The unfortunate impression I get from you Mr. Romik is that an indicator needs to do something unusual. It needs to cook you breakfast and type your letters in order to be of interest. In fact, in order to obtain some value from the DDF, or from pivots, or from the previous day's high, low or close, one has to formulate a rule set around them.
So what is mildly irritating about your "dialogue" such as it is, is that you make no attempt to formulate a workable rule set you just post charts as if that proves something. That is what I call "lazy". Its not just you Romik, its the whole group of you folks. You sit there, and when people who do this work suggest things to you, you act like helpless children waiting for momma to spoon some food into your mouths.
OK, so here is a rule set you children can test.
For any point on the chart, including the DDF, or a pivot, or the previous day's high, low, close, or last hour high, low or close we suggest the following.
For long trades,
Wait for price to close AT, or ABOVE the line. Enter long on the open of the next bar or candle using a stop loss of X points. Use a profit target of X points OR not.
For short trades
Wait for price to close AT, or BELOW the line, Enter short on the open of the next bar or candle using a stop loss of X points. Use a profit target of X points or not.
This is an example of a rule set that you can test using the DDF, any pivot (daily, weekly, monthly) any R or S, yesterday's high, low or close, etc.
Steve