>The Big Sur 11.2.2 update is a good example of what’s almost a null change, yet requires 2.6 GB of installer files to be downloaded for an Intel Mac, and 3.1 GB for an M1 model. For comparison, a minimal update to Catalina required less than 1.2 GB, and for Mojave less than 1 GB, much of which were the seemingly obligatory set of firmware for every supported Mac.

Wouldn't the sealed and tree-hashed OS volume make it easier to provide tiny delta updates?