I also worked at Google. Now I'm using Google's Flutter to build a mobile app. I worry that Flutter will stagnate and become unusable on mobile before I can afford native rewrites. Flutter's mobile support is already stagnating. Flutter Team has left many mobile features half-implemented: iOS widgets [0], dark mode [1], location [2], and camera [3]. They even hired an outside company to work on Flutter mobile extensions [4]. Flutter's engineers have moved on to web and desktop. Others have written [5] about this.
Beware depending on any Google tool for your business.