I can't speak for the folks on that side of the Atlantic, but here we want someone to come down at a normal rate of decsent for a jet and not glide down. If we give you lower, we want you to go down so that we can get other aircraft down or miss some other traffic... Or as we sometimes say when we ask say rate of decsent, and they say what do you want <sigh>, [not what we asked] and then we say we want you to go down like it was YOUR idea and not ours <G>...
regards