Yikes, "reduction in service" sounds right. (Though I'm also hoping that OAK-LAX is classified in the 350+ length...)

As others have said, WN seems to be able to get a beverage service to everyone in coach, even on short hops (like the LA area to LAS), so it can be done. I've heard FAs make the announcement early for anyone wanting a drink to be ready or to look at the menu - no asking "what do you have?" or you'll be skipped! I'm guessing that taking orders (instead of using the carts) lets them go faster (plus on shorter flights they'll usually only give out peanuts not really give a choice, saving a couple seconds per passenger).