Sometimes I wonder if we overthink how much actual work the DVC "perks" team puts into acquiring these. It's fairly shocking how little thought or effort is often put in to business decisions (yes, including large corporations that we all think "have it together"). I highly doubt the perks team "fought" to get this discount. More likely, someone said "hey, what can we throw at them, these parties and card don't seem like enough" and the parks division said "what about an extra day?" and the perks team said "sounds good" and then marketing/pr spun it up in the fancy package we see today and it all took place over the span of maybe 2 days/meetings/emails. I really doubt there was much time spent on it, business processes just don't tend to work that way, in my experience.
That said, all ticket perks have been restrictive since we bought in 2006. The best perk, in my opinion, was the old AP discount as long as you were planning to go for at least 10 days over the course of the year and even that was just kinda okay. I understand the frustration I read here though I don't share it (just my laid back personality). Yes, we bought a timeshare and aren't "entitled" to anything else but DVC SELLS the "magic" of the perks during their sales pitch. They specifically emphasize those as a part of the "membership" - at least they did when we bought our DVC. Contracts are what I do in business so I, personally, knew better but when a customer is sold something with a specific expectation and then that expectation isn't met, it is pretty reasonable to feel frustration over perks that aren't really that great, even if they aren't entitled to them.