InDesign integration is absolutely essential, otherwise Affinity might as well pack up and go home. InDesign is used by such a huge proportion of the market that it's inevitable that Publisher users are going to have to be able to read and write InDesign files to be able to work effectively in the wider design ecosystem. Integrate with InDesign and users will start to migrate from Adobe's very expensive subscription model. Fail to and no one will buy it 'cause they'll be isolated from the rest of the design community.
