sorry, maybe i’m not very clear..
after having a perfect tilt, it can happen that the power emitted by the BTS is so strong that it “leaks” too much into other neighbours. not everybody is leaving in a flat country : with hills or mountains, the coverage can be very hard to control. A little help from the power reduction is always welcome.
there is nothing wrong within the cell, but it pollutes other cells.
and my second example with microcell, it’s a different situation. do you agree with it ?
however, you can see those are very specific case : power reduction is the last little tuning to make a cell perfect. It’s not the first tuning to perform !