Is "detailed" audiophile code for too much treble?

Back to the question, Is "detailed" code for treble boost? Yes and no. There can be more detail in presenting bass instruments, not just stringed, but drums, that has nothing to do with high frequencies, but everything to do with presenting the harmonics of the root frequency and the crispness of the initial contact on string or drum head so as to be true to the original. However, when presenting harmonics of higher pitched fundamental notes, going into the treble range, sure tweeters' capabilities and limitations come into play.

In my case, ratcheting improvement in each part of an increasingly componentized system, I've gotten to where it is more pleasing using the "Natural" EQ of a Yamaha pre-pro's YPAO room equalization, which rolls off the high end more than "Flat". But that from improvements elsewhere in the chain that have increased the detailing throughout the bass and mids (Emotiva DAC, Fosi V3 Mono amps with Sparkos op-amps, Revel speakers -- each an improvement on several generations of other models in those stations).

Brightness and detail are two separate issues, although often finding both in some systems.  Also, people have different tolerances for brightness.  The fix is better/different components. 

@g2the2nd 

When I listen to speakers or components that are described as "detailed". I usually find them to be "bright". I like a balanced response and if there is an emphasis, I prefer a little more mid-bass.

Perhaps it's just that the gear you've happened to hear WAS both detailed and bright. I have similar tastes in sonics -- I prefer more present upper bass/low mids to accentuated upper mids/highs. The buzz-words I watch for in reviews are "lively" and "energetic". Those often indicate a more tipped up, forward presentation. As others have said, detail in and of itself need not be fatiguing. As @kennyc states, we vary in our tolerances for brightness. I have little tolerance for brightness but that doesn't mean I like a dull top end. I want a cymbal to sound like a cymbal. The only sure-fire way to find out what pleases you is to listen to a variety of gear. 

Increased detail can be nothing more than dropping the noise floor with better components or better room absorbing/dispersion control.

Brightness can usually be traced to the high frequency transducer, offen experienced with metallic tweeters like beryllium, but not all metallic tweeters sound bright- depends on the execution.

Another way to look at this, does “reality” have too much detail? Barring the use of excess hallucinogenic drugs, the answer is “no”.
High-end audio is simply a facsimile of reality, so you can have detail without the shrillness - it all depends on the execution

Another way to look at this, does “reality” have too much detail? Barring the use of excess hallucinogenic drugs, the answer is “no”.

But in music, what is reality?

Just one example that we’ve probably all heard.

When I listen to my system, I often hear a piano miced so that I can hear the action/thump of the pedals and sometimes even the hammers retracting.

I don’t think I’ve ever listened to someone play a song on the piano where I had my head in there and could hear this stuff.

So this IS reality, but who’s reality?