When you purchase an AP, you are purchasing the right to enter all four WDW theme parks for 365 consecutive days as many times and for as long as you want. I firmly believe you are not purchasing the right to resort discounts, that's not what you paid for.
As for a discount not being available to passholders yet, I believe that is due to discounts being used to incent AP holders to take an unplanned trip they would not have taken otherwise. This is not an uncommon practice for many resort destinations and theme parks. Most people who purchase a WDW AP are FL residents or are within a relatively short driving distance of WDW. So they can take these unplanned trips. The AP was not designed to offer more than ticket admission. It works out nicely for those that can take advantage of close in resort offers, but of course that is the intent!
Please also remember that when AP holders and FL Residents are given the discounted room offers, they have an advantage no others have, they can book their room/get a discount up to day of arrival. They are the only ones who can do that. Which means, if you cannot get the discount on your already reserved room when the codes first come out, you have the opportunity to get the price reduced up to day of arrival! So unless the resort you're staying at is booked up for some reason, like a holiday or an event, then you will most likely get that reduced rate. That is a great advantage!