By prioritising the platform, you also prioritise the user. As a macOS user, I am happy with how the average macOS application behaves and looks and feels and I

By prioritising the platform, you also prioritise the user. As a macOS user, I am happy with how the average macOS application behaves and looks and feels and I feel like application developers should respect that. Same for someone writing a UWP application for Windows 10, or an Android app. You don't win by degrading the experience on all of your target platforms because it's "easier", you win by carefully considering the people who actually will be using your software and the circumstances under which your application will run.