Apple has released iOS 9.3 beta 1.1 to developers for testing. The build number is 13E5181f.
The new seed fixed several issues:
● Fixed: An issue customers encountered while updating to 13E5181d that caused devices to freeze on the Apple logo. ● Fixed: Starting an app that uses compass data on a device that doesn’t include a motion coprocessor (that is, iPhone 5c and 5, iPad 2, iPad mini and earlier), causes locationd to crash for as long as the compass request continues. Also, Camera photos are not geotagged.
I guess he meant why just an update is soo buggy if the previous version is stable and fine. Because they don't create a completely new software, do they?
Because they change code to add new features, and other things depend on that code to run, changing it breaks other things that they now need to update to accept said new code
Domino effect