That's not true. Turn down service is a perk offered to ALL Deluxe level resort guests, regardless of concierge or not. It is simply *automatic* at the Concierge level, and not automatic for everyone else in the deluxe resorts. IF you want it, all you have to do is let housekeeping know at the beginning of your stay, and you WILL get it for the duration of your stay.
It is not a "maybe you will, maybe you won't" type of thing. They just don't automatically do it for everyone, because not everyone WANTS it, and since WDW has so many families with kids, and some go to bed early, etc. they do not do it unless it is requested.
Most people who stay in Deluxe resorts simply don't know that turndown service is offered to them, but it is.