Do usually warm sounding equipment that are warm take away detail?
What is the benefit of warm sounding equipment and what is the benefits for bright sounding equipment?
Think of it like water from your faucet relative to your body temperature. One hot and one cold. The hot would represent the bass and lower mids, and the cold would represent the upper mids and the treble. Your body temperature would be what is natural. When there isn't enough hot compared to your body temperature the water feels cold and you want to add some hot water. Too much hot water and you want to add cold.
Same with audio. If it's too cold you lose the weight behind the music. A bass guitar sounds flat and distant, male vocals lose soul, drum beats are like tin, and overall it can sound fatiguing. If it's too Warm you lose the sense of detail, the cymbals and high hats are not as clear, guitar plucks seem muffled, extra micro detail seems to be lost. It's about balance to make the whole greater than the sum of its parts to sound natural IMO.
Not everyone shares the same goals and sonic preferences though. Some prefer detail, detail, detail, and want a bright/cold setup. Some want to be bathed in a warm bath of bass. There is no right or wrong when it comes to what an individual wants, but there is also no debating what sounds like real life and what doesn't.