From a business standpoint, 80% of your users will only need 20% of the functionality of your app so for most value added, a simpler interface meets all the requirements. From a user perspective it's become expected that interfaces not be cluttered or 'busy' with clear calls to action - Users have become impatient and fickle, opting to choose apps that are clean and stylish over functional and detailed.
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From a business standpoint, 80% of your users will only need 20% of the functionality of your app so for most value added, a simpler interface meets all the requirements. From a user perspective it's become expected that interfaces not be cluttered or 'busy' with clear calls to action - Users have become impatient and fickle, opting to choose apps that are clean and stylish over functional and detailed.