I agree with you wholeheartedly about the bass. As I have and always will say, bass shakes windows. IEMs that claim neutral are usually bass light. Those present bass as hearable tones but not visceral energy or proper amount to suffice as counter melody.
Completely depends on the music one listens to and personal preference. It's difficult if not impossible to have super heavy, and well defined and textured bass, imho. Also I doubt people who listen to classical are interested in "shaking windows"... Rather on getting the woody texture of a contrabass, which is something I can't hear on bass heavy iems.