Same here in California with the French Dip sandwich.
In it's original form, a French Dip has Roast Beef infused with Swiss Cheese on a toasted Pub Roll with Roast Beef broth based Au Jus on the side.
Everyone has to put their own spin on it and in doing so, is creating something entirely different. You don't put lettuce, onions, pickles, mayo, garlic butter and other crap on a French Dip. If you do, you've created a Roast Beef sandwich.
Also, all those condiments do not work well with Au Jus, at all.