I filed a bug against drupal core in #3284521: Image Styles Entity wrongly assumes styles folder always contains image styles. → about the dangers of the imageStyle::flush() command and it's ability to trash data inadvertently. In that issue, I describe how we had a clone of the production Filesystem Wrapper stored in our schemes to aide in file copying files from production to our local development environments. By doing so, everytime someone made an image style change locally, it would also flush that same image style on production. Frankly we didn't know what was happening until I did some digging.
I propose that we document this.
Fixed
2.1
Documentation
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Issue #3284528 by generalredneck: Document dangers around image style...
Automatically closed - issue fixed for 2 weeks with no activity.