Neutral is good for details and realism...
My Sansui Au 7700 so good it was , sounded less neutral than my Sansui alpha , it was not so less sensible in my speakers/room , but with headphone i even change my french TDA 1543 Dac NOS which was more than good , for a more neutral Hidizs dac and the Sansui more neutral amplifier , because my headphone asked for the highest possible cleanliness and neutrality... They are way more refined than my speakers were so good they were in my room ..
Then ideally we need neutrality as an end goal...