Big Updates Bring Big Problems
The Android Pie update will likely fix lingering Android Oreo problems, but we expect it to bring some problems of its own.
Samsung's beta will help the company catch a lot of problems, but issues always slip through the cracks into the final release.
Big updates like Android Pie typically bring big issues and some Galaxy S9 users could see a drastic difference between Android Oreo and Android Pie.
Samsung almost always has to halt the update in some region due to major issues and we could see something similar impact the Android Pie roll out.
This is part of the appeal of the Galaxy Beta Program. If you hate dealing with issues every time you install a new operating system, you should think about helping Samsung test the software before it's released.