Neutral or Detailed. You can't have both

I always thought of "natural" as a broader more inclusive term. But, I've seen "neutrality" defined as both the "coloration/timbre" thing and also as the "bright/dark" or "warm/cool" thing. Maybe we do just have to sorta be more careful about what we each mean by it.

At least not how I understand the audiophile terms. The problem comes in the mid-treble.

A truly, measurably, objectively neutral speakers doesn’t come alive until the volume is turned up, but will lack the perception of detail, because those details come from exaggerated and often rough treble responses.

...

It’s pretty obvious to me poster @erik_squires is referring to frequency response in the "upper regions" here, and that bringing in "naturalness" in regards to tonality is irrelevant.

From that outset I’m inclined, at least partially, to side with the OP on the matter proposed. From my chair most domestic speakers are dialed "hot" in the treble (and lower frequencies as well), or at least their frequency balance is perceived that way which may also be rooted in the upper bass/lower midrange in particular, where a leanness or lack of energy is not uncommon.

What could be some of the main reasons for what appears to be an intentional trebly focus in audiophile setups? Compared to a live acoustic musical event most home hifi systems don’t come close to replicating the dynamics, their range and overall sheer impact and volume level found here, and so perhaps some compensation for "detail loss" at lower SPL’s in the domestic reproduction is sought to retrieve information or a sense of aliveness, which could translate into a tilted-up treble - and boosted lower frequencies. A loudness effect, if you may.

Or perhaps "detail" as mostly associated with hifi/highend setups is a (bi-)product not really found in the same way in a live acoustic performance, and is instead something that has been cultivated into a desirable trait here. This is also saying that audiophiles at large may not really desire or pursue the imprinting of a live acoustic event as a reference for their home setups, and that High Fidelity has grown into a sonic entity and characteristic of its (closed) own, more or less; indeed, whatever pleases this or that individual (far more than that we really perceive sound differently, which seems like an excuse to justify "subjectivity"). Thinking about it that’s certainly not a far fetched scenario..

Perhaps some food for thought would be thinking about how the very low frequencies affect how we perceive high frequencies. Most home speakers don’t approach 20Hz, let alone forcefully, and yet the frequency area from 20-40Hz, when properly reproduced, affects those upper regions in ways that lend more substance, freedom and authenticity to them. Again, some treble compensation could be at play, but this time around to ameliorate lost LF-reproduction (in typical setups) and its effects mentioned, unbeknownst the link may be.

I’ve found horn speakers to come alive at lower volumes more convincingly than direct radiating speakers, as if their overall presentation is more readily "ignited" and easy-flowing. Although the reasons for this can be speculated into and hotly debated, the effect to my mind is rather obvious still.

I guess what I’m hinting at, and where I may differ in opinion with the OP, is that I find you can have your cake and eat it too - that is: a neutral speaker can come alive at lower SPL’s and be perfectly informative as befits a rather authentic reproduction. Whether that really speaks to the ears of others is another matter, but each to their own (p)reference.

Well, to me "neutral" would entail "detailed", since there are a lot of instruments in music that have sharp, clear sounds.

I have both and love it!!!!!

Reproduction of detail is a function of rise time, both in the electronics (some are faster than others) and the speakers. I.e., how fully  the speakers' drivers fully respond to low level input. The fast ones provide a full response. The slow ones don't. You can retrieve more detail by turning the treble up or goosing the signal to the tweeter, but then the treble becomes hyped up and you lose the neutral tonal balance.
Anyway, you can have detail *and* neutrality if the speaker drivers (and particularly the tweeters) have a fast rise time.
I have a pair of Magneplanar 1.7s and I get great neutrality and realistic detail at the same time. My tube preamps and Perreaux MOSFET amp also help the cause.