That's a very weak reason not to use the messenger. You're confirming that if you want to create a good app, you should not listen to complaining users.
Judging by your comments you're not going to use the app period. You can just say so instead of creating artificial reasons which don't hold true for you anyways.
Sane defaults are a very good reason to decide to use an app. It's very common to reset user settings back to defaults during a "major" (or just marketing) upgrade of an app.
We may have very different samples but I'd be shocked to see that behavior in any app that I'd consider worth using. That would easily knock a couple stars off of my (mental or otherwise) rating of an app.
