Thats a possible set of processes that covers a large gambit of the different large brewers around the world... It is not necessarily however, what happens at any given "big brewery"
For instance.. At a certain big brewery that I am very familiar with, which may or may not have been mentioned frequently in this thread before, no wort stream is responsible for more than two (obviously quite similar) beers - and the vast majority are individual recipes for each beer.
I am also aware of no brewery in Australia that uses PGA.. It might be used, but they are keeping it a secret from the public and from each others lab people too.
And craft beer only tastes better when the "crafter" in question is a decent brewer... I don't know about you, but I have had some truly awful, infected, diacetyl ridden, yeasty, autolisized, utterly abominable "craft" beer.. But I with mega beer... I've only ever had mass produced beer, that was consistent and consistently brewed to a certain high level of quality... Which I mostly happen to not like.
So... Yep, absolutely. I love craft beer and I'm no fan of mega beer... But don't forget the shortcomings of the small brewers when you bemoan the failings of the large ones. And try to get your information both right and in the correct context for the Primarily Australian audience on this forum. Yours was mostly correct... But obviously, and intentionally skewed to make it sound worse than it is. it's bad enough... Exaggeration only weakens the argument.