The Facebook and Instagram iOS apps were/are enormous codebases. Absurd, sprawling monsters with tons of dead code, duplication, and old stuff.. like being writ

The Facebook and Instagram iOS apps were/are enormous codebases. Absurd, sprawling monsters with tons of dead code, duplication, and old stuff.. like being written in mostly Objective-C. I imagine the Gmail app also suffers from having zillions of engineers touch it without being incentivized to make it better or smaller, only to add features and impact for the all-important performance review. Add zillions of instrumentation and third-party frameworks, each with piles of dependencies, and apps will grow without bounds like molecules of gas to fill the container.