A lot of apps have A/B testing going on which makes updating this field difficult.

Not really.

""" Fix bug where sync could fail in Android 7 devices

Also, for a few users we rolled the following experimental changes:

  * X, Y and Z

"""

Discord has been really good with their changelogs but their changelogs in app stores are not as good as the ones in the beta channels. I liked their transparency when they introduced tabs in their Android app.