I'm with Rob on this one.
When I grew up, the Mastering Engineer was the person that made sure the music would fit on the target media, which 99.9% of the time was a vinyl record. There were lots of things to be considered. Too strong of a bass level and the grooves would need to be too wide, which limited the amount of playback time of the record. It also risked having excursions which were so wild that the needle would be thrown from the groove. Next, the engineer would make sure the levels were high enough to overcome the inherent surface noise. The average LP has a dynamic range of 55-65dB. A studio tape probably had more range than that, so some compression would be applied to make it fit into the limitation.
The engineer applied the RIAA equalization curve, made sure the songs would fit in the bounds of the albums side, and probably ran the cutting lathe to make sure everything was done properly. There might be a couple of different versions, one for LP, one for a 7" single since the ability of each was slightly different. You really didn't have to worry about radio, since most stations would take a single, run it through an EQ, compressor and limiter to make sure it fit within that station's parameters, which was often geared to keep things louder than the road noise in your car!
Many of those limitations were removed when CD and hi resolution audio were introduced. However, a funny thing happened... the idea that louder is better became the target. You have a system which can hold 96dB or more of audio range, but the music has been squashed down to use a quarter of that. That led to the loudness wars, and when the various streaming services came into existence, the idea of mastering to optimize for each platform took hold. So now you need a version with -6LUFS for CD, -14 for Spotify, -16 for Apple, -11to15 for Youtube, etc.....
This became the target.
There's no reason that you can't have a CD with a -16 LUFS or even -20LUFS if you have a lot of dynamic range. It won't sound as loud as your typical AC/DC song, but for a singer songwriter track, or a classical piano/violin concerto or a symphony, it can be perfectly appropriate. Gustav Holst's The Planets wasn't written to fit into a -11 LUFS pigeon hole. Yeah, it probably won't be good for background music while you are running the vacuum, or cutting grass since half of the music will be buried in noise. But if you want to sit down and listen to MUSIC, it's perfectly valid.