IMHO, this isn’t a compelling argument. For a large application like a browser, even releasing every few weeks, surely there will not be two or ten changes sinc

IMHO, this isn’t a compelling argument. For a large application like a browser, even releasing every few weeks, surely there will not be two or ten changes since the last release but probably hundreds. If a bug makes it into a new release and none of the developers sees the report and immediately realises where it probably came from, won’t they look for a more systematic method to identify when it started happening than manually examining every change since the last release?