Most people including boom box and car stereo owners don't play their stereos at full blast with the volume turned all the way up. The little AM portable transistor radios of the 60s were played with the volume turned up, so I se the loudness benefit to them but t them alone and people use ear buds now with down loaded files for music, once again not played all the way up. I am surprised that this is still an issue.
I got an OPUS 3 Show Case sampler CD/SACD as a gift from another forum and it's really beautifully recorded. It shows you, CDs can be done well if the producer wants to.