It can be, but there’s no standard in audiophile lingo, so it depends on who’s using the term, and how. "Detailed" can be good, or it can mean too detailed. I think maybe "hot" might be less confusing descriptor of too bright, too detailed, too much treble, etc. When I hear the term "hot" I always know they mean treble that's unpleasant.
Bright can come through in a few ways to me. Treble boost is one of them, and it gets fatiguing after a while. It’s a fairly common tactic with some speaker brands so they stand out more in the store, but it’s usually a short lived novelty.
Sometimes the perception of brightness is not an actual boost in frequency response, it’s simply treble that’s sloppy, etched, or smeared that can result in sibilance, emphasis of certain vocal consonants, splashy cymbals, etc., There’s a bunch of possible causes, but it’s often from overstressed tweeters in their lower range due to poor crossover or other design choices. It can also come from inferior crossover parts and connections, baffle reflections, phase shifts due to placement, and a slew of other less than optimal circumstances. Sometimes it’s just poor synergy across the board. Either way, it’s been a show stopper for me for a long time, and I’ve spent a lot of time trying to eliminate potential causes without loosing the natural open treble with a sense of air and space that comes from really good treble.
