Thank you for the summary - I'll try to go back on this thread (there are A LOT of posts).If you scan any dozen or so pages of this thread, you will find answers to your question.
TLDR: in the pop-rock genre, vinyl releases in vinyl's heyday were in a loudness war. They called it a 'hot' pressing. Lots of really bad sounding music from a pure hifi angle. When CD took over, for the same genre the loudness war got even worse, because digital could handle it. When streaming took over, this initially continued, but recently the music streaming platforms are imposing fixed average levels (eg -14 dBFS), which means, for the first time, applying dynamic compression will make a song sound quieter and hence less arresting. This should make the issue a thing of the past. Fingers crossed. For other genres of music, it has never been an issue.
I hope you are right and streaming levels will really help with dynamic range, but this is by no means certain.
