I did hear the AOD display moves now so less chance of permanent screen burn in, whereas before the update it was static?
But also part of the update is to disable remapping of the Bixby button.
On Google Play Store most 3rd party apps specify what an update is about (if it's added a new language I'll pass, if it adds an essential feature, such as ability to Undo an Action, or fixes a bug then sure. But arrogant apps like Facebook updating itself by the week with just "improves stability and performance" well hell, no!)