Since GrapheneOS was already ahead of the original Android 15 release since it was using A15 QPR2, the step up to Android 16 was probably not that huge in terms of visible features and fixes. More under the hood improvements.
However, did you notice any improvements since updating to the latest GraphaneOS release with Android 16?
Personally, I haven't noticed anything yet. Everything I use daily seems to behave exactly the same as before. Webcam via USB is still kind of unreliable and sometimes requires a reboot to work properly, but that is likely an AOSP issue unrelated to GrapheneOS.
I am curious if you have noticed anything though.
By the way, this post is not meant to understate the work of the GOS team, I am not complaining about the lack of features or anything. You did a great job porting to Android 16 :)