The problem is that the effects you are ascribing to the bridge presence differ from system to system.
With most releases it’s easy to find some people complaining that the bass is better while others perceive it as worse, …
FWIW the tonal balance is essentially identical across most of the DS’s software releases. The differences that people hear are not tonality or frequency response, etc. but instead are the effects of differing noise interference (both conducted and radiated) in different systems. Very small amounts of added white noise can add resolution, very small amounts of colored noise can be very distracting. When noise isn’t in the audio band any non-linearities in a system can modulate it into the audio band: this is very system specific. When the noise is in smaller bands of the audio frequencies it may end up adding or lowering resolution in that band.
The “voicing” that people talk about is really just trying to find the release that does the least damage to the music, it’s not a hunt for some magic tonality, its a quest for the more accurate reproduction possible.