XLA for AOT is useful for cases when you know exactly what architecture you are shipping to, and are ok updating the code whenever the model changes.

TF Lite addresses the segment where you need more flexibility

- you ship single app to many types of devices

- would like to update the model independent of the code itself e.g. no change to Android APK, and update the model over the wire.

Even with this generality, TF Lite is still quite fast and lightweight as that was the focus building it up.