There is absolutely no good technical reason to use any compression at all.There is!!
And it's the only one good reason.
The reason it was made for was to save the ipod earbud brigade from getting their eardrums blown out by the loud passages because they cranked up the volume so much during the quiet passages.
Make everything the same level and save the young's eardrums. And also save the earbuds themselves from blowing up.
Cheers George