No no no, people don't realise what application are a lot better than the ones included with the OS at no additional charged, however they too stripped down, and due to their integration into the OS when the application fails or gets corrupted, you are forced to reinstall the OS - bad design. Any applications integrated into the OS are not reliable enough, and I personally don't trust them.
But the iLife apps are downloaded separately and aren't bundled with the OS. You can delete and redownload them from the App Store if things go wrong.