Hello, I hope this is addressed by the Blizzard Overwatch dev. team. My friend after playing through the PTR has addressed that certain characters will be affected moreso than others due to this change.
Orisa would be negatively affected due to this patch, as well as other tanks in dealing with Reaper. The entire tank class is affected by this patch. Make sure to test how tanks stand to the armor change.
These changes have been observed and the feedback is reported.