While it is true that they require detailed information about your planned travel and accommodations as part of the visa application, once you are approved you can change your plans with no consequences. It's commonly advised to just book fully-refundable travel and lodging to support your visa application, and then cancel them after being approved. This is not seen as an issue. After all, once you have a visa, you're free to plan plan your second, or third, or fourth trip without any consultation or pre-approval.