Just a small nitpick: this doesn't take into account implementation cost. If you want something dynamic like this it means your app has read access to all the a

Just a small nitpick: this doesn't take into account implementation cost. If you want something dynamic like this it means your app has read access to all the analytics recorded (or at least the ones needed for optimization). Most of the times apps only send data to the analytics services, developers read/analyze them and act based on the data. I personally didn't work on any apps that were using analytics read access within the app. So, in most cases it's a lot more than 20 lines to implement an approach like this (hopefully your analytics platform exposes an API with a read endpoint that you have to then integrate into your app) compared to A/B testing, where you just show several versions and then analyze the data and iterate.