One question I've always had on the topic is "why haven't genres like jazz and classical fallen prey to loudness?"
Classical and Jazz music is not subjected to the competitive play scenarios that popular and country music is. Radio play, even background music in bars and restaurants, mp3 playback in cars and portables...all of that motivates aggressive loudness processing. Not that people don't listen to jazz or classical in the car, but radio is already processed for loudness (something record producers still don't seem to understand).
One of the possible answers is that classical and jazz may rely on dynamics more than let's say pop and rock. Obviously you don't want your recordings to get compressed, you can do that for yourself if you want to. Magically "decompressing" something is quite hard if not impossible.
Yes, there's emotion in dynamics. But there's dynamic rock too, if you go back a few decades.
Back when HD Radio was first being kicked around I had the idea for receiver-based processing linked to a "rosetta stone" track embedded in the bitstream. The idea was listeners could dial the dynamics up or down to taste. The choices were not generalized or wild, but rather were producers choices burned into a dynamics control subcode. The "knob" might have had settings for "wide dynamics", "light", "original" and "loud", or better, would have an automatic adjustment based on the ambient noise level in the vicinity of the receiver. Squashed/loud dynamics for cars, motorcycles, and portables out in the noisy world, softer processing for background use, wide dynamics for foreground, etc. It would have eliminated over-compression on the air as well as in recordings, and put dynamics control in the hands were it belongs--the listener--without the producer relinquishing complete control of the result.
My idea never made it off my desk because at the time this was all happening, I worked for one of the companies invested in and lobbying for the messed up HD Radio system we ended up with.
Oh well...another idea got flushed.
Oh, and "my" HD radio system was 5.1 surround. Might have revitalized the music industry by creating a new market for all new mixes.