There is no rule. You decide (as a dev) whether your game should have a small trophy set or large trophy set, and can use a number of different "guides" in determining which route to go. But it's not forced nor is it decided by anyone other than the devs.
Given this is done by higher ups, they may have accidentally thought their game was a smaller one and ended up with the smaller trophy package.
Thanks for the clarification. This explains a lot