The broader the adjustment, the wider the translation

One of the goals in mastering is to make adjustments that translate into improvements in the sound of the master across a wide range of playback situations - everything from big stereos to small stereos to computer speakers to headphones to cars to …

The broader the adjustments, the more likely it will be heard as intended in the widest variety of playback situations.  

For example, a 1db change in overall volume sounds like a 1db change pretty much everywhere.  Similarly, eqing with very broad shelves translates into tonal changes that sound consistent across many different speakers.

On the other hand, very specific adjustments like narrow eq tweaks are much less likely to be heard as intended on a wide range of speakers.  The narrower the tweak, the more likely it will only be an improvement in your room.   Out in the real world it may sound better on some systems, be mostly inaudible on others, or even sound worse than the source.

Before getting surgical better be damn sure you are fixing a problem in the recording and not a problem in the monitoring.