when we build a new feature, it's gated by a flag controlled by the server. The app version with the feature is distributed well in advance of the intended rollout. So, we can't even put the new feature in the change log for the update that includes the feature, and the rollout won't be associated with an app update.

All we can really put in the change log is bug fixes, and the circumstances that result in a bug can often be obscure and hard to describe in user-facing terms, so it gets summarized: "bug fixes and performance improvements". And for the play store and the app store, we have to put _something_.