Most people listen to music in their car. More compressed audio means less fiddling with the volume knob as you drive, regardless of normalization done by Spotify et al.
Anyhow that's my theory
Yep.
Most people aren't in a quiet environment when they listen to music these days. Compression helps significantly with this.
What would be neat would be to have a compression metadata 'guide' that would allow a compressor on-device to perform the compression, rather than baked into the audio track.
This would allow the user to tune 'severity' of compression. In a car / fancy headphones, you could sample the ambient noise level and adjust accordingly.
Or just have the default to be some level of acceptable compression turned on and then an advanced mode to turn it off (or tune it)
Most headphones people actually use are crap. Yes you can buy studio monitors from sony. That isn't what people are listening to. They are using airpods which sound like earpods have always sounded: crap, absent lows, terrible separation. So you compress the hell out of the audio and make it loud so you can actually hear something with those headphones.
What AirPods are you talking about? The wired AirPods that sound pretty bad have been overtaken by wireless Bluetooth AirPods for many years now. The AirPod Pro 2 sound quality is a world of difference from the wired earbud style AirPods. In fact, most of the most popular TWS Bluetooth Earbuds have fantastic sound quality. The main issue with them is that they have a V shaped tuning, with various levels of bad. However, Apple and Samsung tunings are quite decent.
All of them, compared to over ear monitors. You can't out engineer physics advantages of a larger speaker. Airpods fall short of other in ear monitors too fwiw, so they are a poor choice in class.
Physics doesn't prevent reproduction of bass in IEMs. Thanks to inverse square scaling of sound pressure with distance, putting the driver within the ear canal greatly reduces the required output level to the point where even tiny drivers can handle it. Lots of IEMs can reproduce loud, deep bass with low distortion.
You of course miss the whole-body tactile vibration effect of loud bass played on speakers, but the sound itself is there.
And you can buy replacement ear pads - breathing new life in to $150 Sony Studio Monitor phones I bought 30 years ago...
Those things you can tear open and re wire yourself if you really needed. Ship of Theseus mdr7506 is possible. Meanwhile how long do those airpod batteries last before you need to pay apples pizzo for replacement you can't do yourself? Some people say only like what 2 years or so. Rich coming from the company that no longer ships chargers due to ewaste concerns.
It's much less of a problem than it used to be because streaming platforms normalize the tracks anyway so it's been fading away for a while now.
As a mixing engineer:
1. Compressed sound can be an integral (wanted) part of different genre aesthetics. I personally love dynamic mixes, but if you let your customers A/B mixes they will often chose the more compressed/louder one. If your song sounds weak after another bands song, that is an issue.
2. For reasons of health/liability there are maximum levels on headphones and mobile playback devices. That means if my mix has a high dynamic range the bulk of it may really just be too low when played back on the majority of headphones. If I mix my own music this is a bargain I can make if I mix other peoples music I would try to be a little more on the cautious side if the musicians didn't demand a highly dynamic mix.
3. Compressed sound works better in noisy environments and as background music. 90% of people who listen to music do not listen to it actively, they just let it run in the background or are passively exposed to it. Try listening to a good dynamic recording of Beethovens fith in your car with the window rolled down. You will hear some strong phrases then inbetween nothing as it is below the ambient noise floor.
Vinyl has the benefit, that I as the mixing engineer can assume that the listener will be much more likely actively involved with the music than say in a radio mix.
And just wait until they find out that compressor/limiters came about for reasons other than shaping the dynamics of music. If you're not slammed against the wall, your AM broadcast signal isn't going far.