Different speakers handle different kinds of music differently.
Let's take some Magnapans. Very open and "neutral" speaker to me. IMO, not a good "rocker" without a good sub. Now, let's take some Cerwin Vegas. Awesome rocker but not so good at acoustic and classical music and definitely not a neutral speaker by any means.
Neutral speakers are often considered to be the goal of speaker making by "audiophiles" but that's simply not always the case. There is nothing wrong with non-neutral speakers. They have their place.