I’m always a little surprised that the simple d100 (or the simple % dice) isn’t used in more games. Think about it. Everything is easy to understand if you think you’ve got x% chance to succeed. So why so many different dice? Is the curve really that different?
Confession one: my favorite d100 system was Amazing Engine. I loved how you could look at the 1s position to know if you had a critical. The original Top Secret gets a close second.
Confession two: I think that the answer is just that it is fun to roll lots of dice. The more the merrier. We have been conditioned by Yahtzee.