Guidewire introduced Extension Layer and an Extension Manager app for the Guidewire Cloud Platform, isolating InsuranceSuite customisation into managed and unmanaged modules so extension upgrades apply automatically to the managed module with backward compatibility validation instead of manual three way merges.
Our readExtension upgrades are the reason InsuranceSuite deployments fall behind release versions, and falling behind is how an insurer ends up unable to take a security patch without a project. Automating the merge and validating compatibility addresses the actual cost of ownership rather than the licence line.