Yes, maybe I should clarify that.

A 100 track song doesn't have 100 different roles playing at the same time though.

The less different roles you have, the better in terms of loudness. But you could dub the same role many times to achieve a bigger or wider sound.

If you use a lot of dubbing then both the dynamic and especially transient control of each individual track and the sum compression of the group become even more important since it allows you to treat those many tracks as a unified group, i.e. almost like a single instrument with a common dynamic controller.

Let me add that the "100 track" production often contain a lot of tracks with just a single sound or effect which often inflate the numbers.

Thanks, that's great!