That's a good point - if you paid for the DP then you'd be pretty miffed to not be able to use a sizeable chunk of it.
Yet of course, even if you get FD, you're paying for it anyway - it's just rolled up into the total price.
We're going in November and have upgraded from free QS to the standard DP. However, after many years of staying on-site, we've booked a villa for next year - we just don't think the included FD carries the same value anymore and have begun to resent being 'forced' to take it.