You'll find that not every proprieter or LHBS employee reads every forum or book or listens to every podcast, so the last book or info they may have learned may be in Papazian from 30 years ago. They also may only brew kits. Or simply JUST be of the "you can't teach an old dog new tricks" mentality.
And not every person, especially one of those "you can't teach an old dog" types aren't going to be up on the latest ideas.
Remember to a lot of LHBS'er or employees, it is only a job..not an obsession...so they are not always as necessarily passionate, or zealous learning new things, or trying new techniques, like we are....SOme even though they have been in the business forever, may never had progressed in the hobby beyond extract kits...some may rarely brew at all.
So often it is not surprising that we know more or are at least in touch with more info that someone who does it for a living....
This is an ever evolving hobby...Places like this is where you find the most state of the art information/wisdom about brewing, because of the sheer number of us trying new things, hearing new things, and even breaking new ground and contributing to the body of info on the hobby...Look at some of that inventions that came out of here, and then ended up later in BYO articles by our members...
It is podcasts and forums like this where you will find a lot more state of the art, or current views, and even scientific information...I mean if Jamil, John Palmer or Papazian even farts on a podcast, one of us beergeeks are going to start a thread on it within 10 minutes.
I tell folks to stick to their guns, just buy what you need and if they seem oldschool or closeminded, just don't even bother. You can find all the most recent discourse, data, tips, tricks, theories, ad nauseum online, in BYO/Zymughy and on podcasts, with very little effort.
Like David said, there rarely is an "ideal" way to do ANYTHING, just what works for us. So if an owner is closed minded or oppinionated and thinks his way is the only way, just nod and smile, and go possibly make better beer than him.