Since a long time, we have been boasting that native apps are second to none. They are the ultimate ruler of the mobile app development world. But, the reality is that Flutter has changed the landscape of the mobile market. Google's UI framework, Flutter has not only proven to be the best cross-platform tool but has also hinted that it would rule the mobile industry when Google replaces Android with Google Fucshia. In such a scenario, turning towards Flutter has become the need of the hour for Android developer. 
But in case you still need a valid reason to consider Flutter, here's a blog you must read:- Why Should Android and iOS App Developers Consider Flutter in 2019?