I expect a package maintainer to have a clue what changes went into the package they maintain. At least for security reasons, so when upstream gets hacked and/or goes crazy and inserts malware in the code it gets caught.
Otherwise all security that surround distributions is for nothing if they package whatever comes upstream (via unsecured FTP sites and whatever).
Not even reading the release notes is in my opinion very far from having a clue what changes are applied!