Is "detailed" audiophile code for too much treble?

no

"But since human hearing is not flat, a flat response could yield all kinds of lows and highs a particular listener does not want."

So if you roll off the highs and your ear is rolling them off further, you take too much away. Natural sound is not produced "rolled off".  It goes from infrasonic to ultrasonic.

Like so many audiophile terms, it means what you want it to mean.... 

@phusis 

Some of it probably comes down to semantics and ascribing different meanings to chosen terms

Well worth keeping in mind for this discussion! 

Most of the time brightness or sharpness in a system can be attributed to the upper midrange and not treble at all. It's often the sooner arrival time of the midrange in relation to the bass and high frequencies.