Great, so I can speak at a higher level!
So first DCC being a square wave, we have ringing, etc. distorting the signal.
The reflections at the ends of tracks will be necessarily out of phase reflections and further distort the signal, in extreme situations can radically reduce the signal as you know about an 180 degree out of phase signal.
In HO layouts, where the largest market is, it is very common to use a "snubber" at the end of any track segment, normally a resistor and a cap in series, to kill any reflections.
So, the problem of too many feeders is the potential for adding more signal that is not exactly in phase, due to the difference in distance since there is more than one path to any location, and by putting feeders close together, you actually enhance that danger....
most DCC issues is distortion of the waveform, not power issues.
soldering jumpers of course helps indoors, and outdoors the ultimate is bonding track sections together, better than clamps.
Anyway, there's the gist of it, more feeders can control voltage drop and get around bad joiners, but can have a detrimental effect on the signal quality.
Some day, let me tell you why stainless steel track is better for signal integrity than brass track...